Lewis A.wrote a review of Black Diamond Prime Alpine Touring Boot - Men's on February 12, 2013
Familiarity: I've used it several times
I had the older version of these boots, but I'm sure BD has only improved on them. They are a good boot for the beginner backcountry skier. I took them to Southern Alaska for a 24-day tour, and they were great on ascents and in camp (warm, great walk mode, very comfortable, super lightweight); however, the descents were not as impressive. I wouldn't feel comfortable doing, and I actively avoided doing lines that were too extreme; they simply don't have the response I would want to feel comfortable navigating through all-or-nothing chutes, which is too bad.
I have a pretty fat foot, so I like the BD fit, the BOA lacing system is awesome because you can tighten them up for ascent and then even more at the top if need be, and the heat-mold liners are great if you do them (I considered intuition liners, but didn't feel the need after my trial runs in the Sawtooths). I still use them after putting them through a considerable amount of wear of the mountaineering variety, and I got them on sale for 4 hundo, so they were definitely worth the price. Overall, I've warmed up to them for the intermediate level backcountry terrain and more advanced mountaineering that I do. If you want something more serious and want to be aggressive downhill, go with a higher flex definitely. I would recommend them with reservations.