I tried on three AT boots. All had uncooked thermo liners.
Scarpa Spirit 3
Garmont Megaride
Dynafit Aero Freeride
Volume, least to greatest:
1) Aero. Small all over. This feels like a Lange alpine boot, overlap shell and all. Not for people with wide feet...I'm not even a C and it was tight. Volume top to bottom is very low, too: if you have a tall arch your instep will get crushed. I can't imagine anyone having room for footbeds in this thing.
2) Megaride. About a C width, more room top to bottom than the Aero. Still smallish in the heel pocket. Enough room for footbeds unless your foot is tall.
3) Spirit 3. This has the usual Scarpa AT thing where the bottom of the shell slopes inward, so it squeezes your foot even though there's tons of room. Put in a footboard or two and you have a solid D-E width. Absolutely gigantically huge above the foot. Big in the heel, too, although the instep buckle helps.
Stiffness, least to greatest:
1) Spirit 3. Not by much. It's not a noodle by any means, but the tall cuff makes it feel less stiff than it is.
2) Megaride. Definitely stiffer, but it's not a night and day difference.
3) Aero. This is alpine boot stiff. You could blindfold me and tell me I was in a midrange Lange.
Weight, least to most:
1) Megaride
2) Spirit 3
3) Aero
None of these boots are light, but the Megaride weighs a little less than the Spirit, and the Aero weighs maybe a little bit more than the Spirit. I don't think the difference is a deal-breaker...if you're watching ounces that closely, you want a different type of boot.
Walk mode, worst to best:
1) Aero. The walk switch helps a little, but it still feels almost like walking in alpines, just with less slippage. Not my choice for long stretches on foot.
2) Megaride. Huge difference...much easier to walk. The cuff bends backwards a lot more than the Aero and it's much less stiff in walk mode.
3) Spirit 3. Easier than the Megaride, but not a huge difference. Both work pretty well.
General:
The Aero has noticeably more forward lean than the other two.
If you want your AT boots to feel like alpine boots, the Aero is your choice -- if you can get your feet into them. It's very solid, feels well-made and well-finished, and I think it's the best-looking boot. You will sacrifice ease of walking, though it's better than your alpines. I wanted to try on more Dynafit boots, but that's all they had.
If you've got a low volume foot, Megaride. If you've got a high volume foot, Spirit. In my opinion, they're not different enough in weight or flex for that to override the radical difference in fit.
Hope this helps.
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