That's surprising to hear. My smartwool's have been the least durable by far. It all probably depends on foot shape, sock fit, and shoe fit though.

My darn toughs are ugly as hell, but warm and super durable. I do agree with others that they are tight around the ankle/calf but it doesn't bother me personally.

I also agree with the comment above that they aren't truly BIFL. No sock is, but I haven't found better yet.