They look cool (to some, of course), but they're definitely not all that durable. They tend to crack at the steerer hole – and I can't imagine how quickly one would crack if it were bored out to accept a 1"1/8 steerer. I've seen two broken ones in person, and I'm pretty sure Keevohn from here broke two himself.

I have a 140mm one that I'm contemplating selling, because I like having teeth.