The design and quality of manufacturing were superior to anything else I had seen. There are sliders in all the right places as well. I REALLY wanted these to work for me, but sadly, one foot was just too tight (fat/wide/whatever), and I couldn't justify spending another $45 on a stretcher in the hopes it would make it good enough. They are wider than the Alpinestars, and Tourmaster wide boots I tried. Ended up with AXO Aragon boots, which are kinda funky, but fit.
Boots fit true to size at least in 13's. Am able to tighten them up on my foot with the cable lace system, so the foot doesn't move inside the boot and enables crisp shifts. Just got them so don't know the durability. They seem expensive for short boots, but my cheaper boots started falling apart right away. I like them a lot.
The rubber soles of my 2005 Vertigo Corsa boots were crumbling from the material breaking down. The shop charged $20 to replace it. Be sure to remind the person doing the replacement that the soles are to be heated then stretched for a proper fit as they come a little shorter than the original soles. The pattern of the replacement rubber soles are different from the originals on my boots but that doesn't affect anything.
Hard to rate a pair of boots that you can't even get on your feet.
I thought these boots were poorly engineered. I could not get my feet into them. The gizmos that tighten them up are made of cheap plastic, and were so hard to open I thought I would break them. I had to send them back for a refund because they are no good if you can't wear them, and I knew those plastic fasteners would eventually break. At $350 they are way too expensive for what they really are. Can't say anything about durability, never wore them.