I have a pair of woolies tights that I pulled up one day I guess a bit too vigorously and my fingernail went through them. My woolies shirt doesn't have any holes - but I have a few ibex polo type t shirts that have developed holes after a couple of months. I have a couple ibex hats that have developed holes.

Smartwool - generally with it, I find that you either get holes in the first few washes or holes don't seem to come up. I don't know if it's just an implicit weakness or flat in the wool... I have some smartwool socks that developed holes the first time I wore them, yet I have several other pairs that I've worn a ton without problems. I just don't buy smartwool anymore, cause it's a pain.