I have a pair of Mazamas that are about two years old and really like them. They are very stout and need some break in time. I have yet to wear crampons with them but have climbed 5.4-5.5 rock in them without any problems. Before that I had a pair of LaSportiva Makalus and though they were comfortable, they seemed to soak up water like a sponge. And yes I tried all the waterproofer/sealers out there. As stated above fit, fit, fit!