I got these boots since I needed to replace my blown out BD Factor MX 130's. Coming from this boot which has a higher cuff I was used to being able to drive any of my skis very aggressively. I tested these day 1 at the resort and on the first turn, I folded them over more than any other boot I had owned. I was shocked and a bit terrified as these were going to be my hard charging backcountry boots for big lines. These boots are a compromise between the world of light and fast and hard charging performance. Unfortunately they don't do either extremely well. After a few runs I got used to the lower cuff. You simply cant ski these aggressively like a race boot. They take a bit of finesse and do very well in soft snow conditions.
The weight savings are really noticeable on the way up. I was able to shave time off my regular tours without added effort, which is invaluable on big days. They did well driving my light touring setup on the down in soft snow. The flex is more noticeable in firm conditions.
The rockered sole is nice for the stride, but I find the severity of the rocker to be an issue with matching crampons. I have smaller feet (size 24.5/25 mondo) and find many crampon toe bails dont mate with this boot very well. I've gone so far as to mix and match different brand crampon parts to get a more secure fit.
These boots are far from perfect and a friend of mine had the cabrio cuff crack on his first day in them in cold conditions, but so far I have had great luck with the durability. The buckle adjustments tighten down nicely, the toe pin connection works flawlessly, and the ski walk mode had a fantastic range of motion.
If I could do it all again I would probably get the Scarpa SL120 for driving my bigger skis and continuing to take the hit on weight and the Dynafit TLT 7 for light and fast missions.