In answer to Rancid_Pickles writeup it isn't true that titanium frames don't bend...believe me, they bend very well when you shift your entire weight onto the foot you have just placed on them (ever since that incident I have always been wary of placing my glasses on the floor, but there are times when it just can't be avoided).
However, although I had mashed them completely flat I managed to bend them back into shape, but since that I haven't had to adjust them either.

Oh, and the light weight is also a big plus IMHO.