I had a pair of the mountains, (the blue ones) I bought athem at climb max, last year, used them once on grippy rock, they were like glue, but the soles disintegrated, I sent them back to Madrock and they treated me well, they said that there was a problem with the compound in production. I sent them back and they sent me a pair of the alpinist, (the red ones) which are identical in every way except they have a 5 mm closed cell insulation instead of 3 mm and so are a little warmer. I used them this winter about four times in snow and found them to be very light, very comfortable, stiff and warm. I used them this last weekend on trails and rock in torrential rain and they were comfortable and very waterproof. I have stood in water up to my ankles for minutes and have felt nothing trickle through.
I like them a lot. I think the downside of them is that they will be hard to have resoled, I may be wrong about that. The blue ones are less stiff.