I have a pair, but have only used them a handful of times (too busy skiing ). I came from uninsulated leathers as well, these are way warmer than my old Sportiva Eigers.
The sole is a bit fragile, chunks of rubber around the edges have been ripped out. Haven't done any postholing, so I can't comment on the waterproofness. I think I'll seamgrip the seams for better abraision resistance.
Very light and dexterous. I wouldn't mind them being a bit stiffer, but I put more leverage on the sole than most. I have wide, flat feet, and these fit pretty well.