Having used the same pair of Dachstein mittens for over 35 years I can attest to their durability and versatility. I climbed four volcanoes and many other mountains in Washington State with them, and have taken them on innumerable x-c ski and winter camping trips. I never had any problem holding onto ice axes or ski poles, even when I used shell overmitts.
Just recently a hole appeared in one thumb, I think because of the way I hold x-c poles and the constant rubbing (my wife's pair, purchased at the same time, is fine, but she hasn't used them as much). I hope to be able to repair it.
If not I'll purchase another pair in the hope they are of the same quality as the originals. If they are I'll will them to my children or grandchildren.