Had the chance to try these out on your normal everyday ice climbing route, and a chance to kick my way up Ta Chute in Little Cottonwood UT, in search of some ice routes and they performed great. My feet stayed warm and dry, with a 3000 ft ascent kicking each foot and they did really well tramping through the woods at 5am in search of the valley we were trying to find.
The sole is very stiff and reduces foot fatigue when you're on vertical or nearly vertical slopes, tread is great, and the crampon grooves fit nicely with my Black Diamond Cyborg Clip Crampons.
All in All, I'm excited to test these boots out on some serious peaks above 14k!!!
Look at the bottom of my review for my contact info. Feel free to email or call if you have any questions about my review or this product.

I just got these boots for times other than double boot territory and they are terrific. Due to very cold feet, I've used the Spantik boot for years above 14k with good results, however, I needed a more nimble boot. These were surprisingly warm in about a foot of snow on Mt of The Holy Cross above 14k. I used only a pair of compression socks and was very warm. The fit is unbelievable. For a size 8.5 I ordered a 41.5. The heal lock is perfect and there is a ton of room in the forefoot. When I first looked at the boot it seemed as if the forefoot would be too loose, but in fact the fit is better than any other. I took it on 12 miles and 5k elevation gain right out of the box with no blisters. Way more comfortable than I could have imagined. Highly recommended for anyone looking for a cold mountaineering boot.

I got these boots about a year and a half ago and have used them in the Tetons, Lost River range, Lemhis, and Hyalite. They are well made and keep my feet warm all the time. There are locking D rings so that you can adjust how tight the lower and upper parts of your feet are. This makes the approach hike much more pleasant. When you do tighten up your heel for the climb it stays in place perfectly. I love these boots and would definitely recommend them.

Just had these boots on the top of Rainier, weather was cold enough that I needed all 5 layers and my feet stayed warm. Inside of boots have a smooth feeling all the way around and heel lock is great. Wore these with minimal break in no problems. You can definitely tell these boots are made with the latest techniques. Probably saw more of these on Rainier than anything else, maybe due to the fact that Whittaker Mountaineering rents them. I would recommend sizing up maybe 1/2 size for a comfortable fit and fine tuning it with socks, this is what worked for me, different thickness of socks makes all the difference on dialing in a fit. Boot works well with BD automatic crampons but front toe welt is small than some other boots. Hybrid crampons would definitely work well with these boots.

On ice, heel lift is the enemy of all things fun and good. If your feet aren't good, everything else falls apart. These boots (for my feet, anyway) are simply perfect, locking everything down and creating a stable, super rigid platform. They're amazingly light yet completely protective.

So that's awesome, but what if you don't climb ice?

Loosen the three pairs of speed laces at the top of the ankle and these will hike really, really well. I don't mean suck-it-up approach style... I mean these hike better than 90% of hiking boots. As long as your ankle isn't locked in, they flex comfortably to move over variable, rocky trails without any issue.

I haven't thrashed them for a season or two yet so I can't comment on the durability, but everything else about them is absolutely awesome. And LS has a solid reputation among guides who have used various incarnations of the Nepals for many, many seasons, so I'm unconcerned. The fit and finish, and craftsmanship is evident throughout. These are exceptional boots.

Quick word on fit - I was climbing in Scarpa Jorasses Pro size 44 and went up to 44.5 in these, but I have a wide forefoot. Sneaker size is 10.5.

Third time writing this because apparently I'm too stupid for the internet.

I bought these after suffering through double plastics for too long and the difference is palpable. On ice they feel super stable while staying light and agile, immediately I saw a difference in the confidence of my feet and my overall comfort on the ice. I've also used these for winter "mountaineering" in the Northeast, they've been a huge relief, despite the rigid sole they walk/hike brilliantly both with and without crampons/microspikes. Construction has been bomber so far, I've only used them for give or take half a season but there is nothing so far telling me that the construction is inferior to the Nepal Evos. A sticking point for many people may be the price, I got these at a discount so it wasn't an issue for me, but the real difference between these and the Evos is 4oz and 70 dollars so take that as you will. These are very nice boots and I can't wait to use them for years to come.

Size right! Either go to a brick and mortar store to try on various sizes or order a few pairs here and return the sizes that don't fit, Backcountry is really good about that.

Street shoe: 8-9
Nepal Cubes: 42.5