I ordered both the alp and mtn trainer. i wear a size eleven running shoe but ordered in a 10.5 and 11. i kept the 11 and so far couldn't be happier. the alp trainer seemed a bit narrow. i could easily roll my ankle, like another reviewer stated, the mtn trainer has more ankle support and seemed less likely to "roll" resulting in a tweaked ankle. i've taken them on 5 hikes ranging from 4-8 miles, two of which had an elevation gain of 1000ft in the first mile. No BLISTERS! Had to tighten em' up on the way down but they were great. These boots seem to improve with each subsequent hike. i'll be taking them up Mt. Baldy this weekend. im expecting the same result. if not, i'll update the review. i've had quite a few boots, asolo, vasque, lowes and kayland. these for my needs have been the best.
i purchased my wife a pair as well, albeit the womens version and she didn't like them. they felt narrow in the toebox.i then tried a mens size for her and they were "sloppy". so i guess they aren't for everyone. but best boot i've used so far.