assistant: You've got a solid foundation in the Evo SL — that nylon plate and aggressive rocker are great for tempo and uptempo work. For marathon build-up, you're right to add a carbon-plated option into rotation; the question is whether you want a true super-shoe (race-day pace, ~150–200 mi life) or a super-trainer (daily-trainer durability, built on race foam). Given your 40 mi/wk volume and marathon focus, here's what I'd consider: **Nike Alphafly v3** — This is the most versatile pick for your situation. It's a true super-shoe, but Doctors of Running and The Run Testers both flag it as comfortable enough for long runs and marathon training, not just race day. The ZoomX foam + forefoot Air Zoom units give you excellent energy return for tempo and threshold work, and the moderate rocker won't feel jarring if you're coming from the Evo SL's aggressive geometry. Weight is 198g (vs. your Evo SL's 235g), so it's noticeably lighter without being skeletal. True-to-size fit and excellent lockdown mean you won't need to fuss with sizing. **New Balance SC Elite v5** — If you want something that leans slightly more toward comfort and durability within the super-shoe category, this is it. Doctors of Running calls it "one of the most comfortable" super-shoes and notes it's a contender for super-shoe of the year — a rare endorsement for a racer. The FuelCell 100% PEBA foam is springy and responsive, and the stiff full-length carbon plate relaxes after 30–40 miles, which matters for marathon training blocks. The wider toe box (for a racing shoe) and stretchy upper are bonuses if you swell on long runs. Drop is 8.0mm (vs. your Evo SL's 7.0mm), so the transition is minimal. One caveat: Doctors of Running notes the heel counter can bother sensitive heels, and the narrow midfoot/heel might feel snug if you have a wide foot. **Mizuno Hyperwarp Elite** — This one is lighter (170g) and more aggressive than the other two — it's a pure speed tool, not a trainer. The drop is 3.5mm (vs. your Evo SL's 7.0mm), which is a meaningful shift toward a forefoot-biased landing. EDDBUD ranks it above the New Balance for outright pace. If your marathon goal is a PB and you're comfortable with a lower-drop, more responsive platform, this works. But it's less forgiving on long runs and has a half-size-down fit quirk that adds friction. I'd only pick this if you're chasing a specific time goal and want the most race-ready option. **Saucony Endorphin Elite v2** — Excellent reception, carbon plate, high cushion, and $290 MSRP puts it in the same tier as the Alphafly. I have lean data on this one (no detailed reviewer notes in my set), so I can't speak to how it compares on comfort, rocker feel, or fit specifics. If you've heard good things about it or have a Saucony fit history, it's worth trying on, but I'd lead with the Alphafly or New Balance based on the reviewer depth I have. **Top pick for your marathon build-up: Nike Alphafly v3.** It splits the difference between race-day aggression and training durability, the expert reviews specifically call out marathon comfort, and the fit is straightforward. You can use it for your long runs and marathon-pace work, then shift to race-day focus in the final 4–6 weeks. One question: Are you targeting a specific marathon time, or is this more about building fitness and having a strong race-day shoe ready? That would help me calibrate whether the Hyperwarp Elite's extra speed edge is worth the lower-drop adjustment.

assistant: Good news: all three are legitimate step-ups from the Evo SL for what you're after, and they sit in different niches depending on how much responsiveness vs. cushion you want. **Nike Zoom Fly v6** — This is the closest cousin to your Evo SL. Same 8.0mm drop, same ZoomX foam (though paired with EVA here vs. the Evo SL's Lightstrike Pro), and a full-length carbon plate that's less aggressive than the Evo SL's nylon. The Zoom Fly is heavier (244g vs. 235g) and sits higher (40/32mm stack vs. 37/30mm), so it's a touch more cushioned. Experts rate it excellent for marathon training and long tempos — it's designed to handle 40+ mi/wk. The carbon plate gives you that snappy turnover without the aggressive rocker of the Evo SL, so transitions feel smoother. True-to-size fit, no surprises. This is your safest bet if you want a familiar ride with more cushion. **Saucony Endorphin Speed v5** — Lighter (238g) and lower-stacked (37/29mm) than the Zoom Fly, with a nylon plate instead of carbon. The drop matches your Evo SL at 8.0mm, so biomechanically you're on familiar ground. The PWRRUN PB foam is snappy — reviewers call it responsive for speed work — but the nylon plate is subtler than carbon, so you get turnover without the propulsive kick. One caveat: the card flags mild overpronation as the intended pronation profile, and you're a midfoot striker with neutral biomechanics, so this shoe isn't optimized for your gait. That said, it's still a neutral-stability shoe and works fine for neutral runners; it's just not tailored to you. At $180, it's the cheapest option here and well-regarded for tempo and marathon training. **Hoka Mach X v3** — This one's different. It's a speed-training shoe, not a racer, and it's built on max cushion (46/41mm stack, 5.0mm drop). The drop is 3mm lower than your Evo SL, which biases your landing slightly more forward — a small shift, but worth noting. The Pebax plate is nylon-adjacent (responsive but not aggressive), and the dual-density foam (PEBA + supercritical EVA) is designed for high-volume training with protection. At 266g, it's noticeably heavier than the other two. Hoka's rocker geometry is forward-curved, which pairs with the lower drop to reduce late-stance calf load — good for turnover without pounding. Experts rate it excellent, and it's versatile enough for easy runs through tempo work. The trade-off: it's more of a daily trainer with speed capability than a speed-training shoe that doubles as a trainer. If you want cushion-first with turnover as a bonus, this is it. **For your situation — same 40 mi/wk, midfoot strike, no PR pressure — I'd lead with the Nike Zoom Fly v6.** It's the most direct upgrade from the Evo SL: familiar drop, proven marathon durability, and enough cushion to protect your legs without sacrificing the snappy feel you already like. The carbon plate gives you a step up in responsiveness over your nylon Evo SL, and the expert reception is excellent. The Endorphin Speed v5 is a close second if you want to save $10 and don't mind a slightly firmer, more minimal platform. The Hoka is the outlier — pick it if you find yourself wanting more cushion on easy days and don't mind the extra weight. One follow-up: are you planning to use this shoe for all your workouts (tempos, long runs, easy miles), or just the uptempo / tempo work while keeping the Evo SL for easy recovery?

assistant: You've got the Zoom Fly v6 pinned, and that's the right call for your situation — stick with it. Here's why: **Zoom Fly v6 vs. Endorphin Speed v5:** The Zoom Fly wins for you on three counts. First, it's a speed-training shoe (your stated category); the Endorphin Speed is optimized for mild overpronation, and you're a midfoot striker with neutral biomechanics, so you're fighting the shoe's design intent. Second, the Zoom Fly's dual-foam midsole (ZoomX over EVA) is more forgiving than the Speed v5's single PEBA layer — at 40 mi/wk with tempo work, durability and comfort matter. Third, Ben Is Running specifically calls the Zoom Fly v6 "a training companion to the Alphafly," which is exactly your use case: uptempo work and marathon-pace training without the race-day aggression. EDDBUD also notes it's the better-priced alternative to the Speed v5 even though the Speed is "more nimble" — but nimbleness isn't your priority; versatility and leg protection are. **On the Adizero Prime X 3 Strung:** Not overkill at all — it's actually a different animal than your current Evo SL, and it could be a smart complement. The Prime X 3 Strung is a long-run / marathon-training shoe (46/41mm stack, maximal cushioning, dual-layer carbon plate), whereas your Evo SL is a speed-training tool (37/30mm, aggressive rocker). At 40 mi/wk with marathon build-up, adding a dedicated long-run shoe makes sense: you'd use the Zoom Fly v6 for tempos and uptempo work, the Prime X 3 Strung for your long runs and easy-paced marathon-effort work, and keep the Evo SL for shorter intervals and track-style sessions. The Prime X 3 Strung's 7.0mm drop matches your Evo SL (only 1mm lower than the Zoom Fly), so the biomechanical transition is smooth. The trade-off: it's heavier (286g vs. 244g for the Zoom Fly) and costs $300, so it's a third-shoe investment, not a replacement. **My recommendation:** Commit to the Zoom Fly v6 as your primary speed-training / tempo shoe. If your long runs are consistently 15+ miles and you want dedicated protection for those efforts, the Prime X 3 Strung is worth trying — but it's not necessary at 40 mi/wk unless you're feeling beat up on the Evo SL's lower stack. Test the Zoom Fly first for 3–4 weeks, then decide if you need the extra cushion on long runs. One question: are your long runs already 15+ miles, or are you building into that as part of your marathon prep?