Brody wrote a review of Black Diamond Prime Alpine Touring Boot - Men's on November 22, 2013
Familiarity: I've put it through the wringer
boa liner: actually pretty neat. no complaints. but, also totally unnecessary. assuming you care about comfort while touring. i've heard that when they break, they are very difficult to field repair.
weight: slightly outdated for a 3-buckle boot. i'd be more inclined to go to a TLT or something similar, which I believe would perform just as well.
buckles: solid. i really like them.
walk more: not super easy to trigger all the time, but usually works just fine.
on/off: easy to put on and off with pull tabs and the liner.
walkability: there're better out there, but there are also much worse out there.
soles: great, durable, grippy vibram.
I very much see these boots as filling an important void between your first pair of touring boots (which are bound to be some ridiculous 5-buckle heavy monsters to use with your Dukes or whatever), and your third pair of touring boots (which are going to be lightweight, proper, and actually a good decision). In that vein, I would put these in the same category as the Dalbello Sherpa.
Oh yeah, and I've spent a week park skiing with these things in regular DIN bindings. That may or may not have been a mistake.
Overall, they're great boots. Really. But, at the same time, they kinda suck.
I would recommend them to all of my friends using the BD Quadrants or whatever the other heavy boots are called. But to someone using a Dynafit or Scarpa boot, I'd probably recommend that they keep what they have.
These walk better than they ski. And I rarely object to that concept. But given their weight, I'd expect the opposite.