In reply to sean1:
I've got a petzl alto. I don't have anything to compare it to apart from an alpkit phud but the petzl is laying better than the phud (I would hope so with the price difference!).
I've only had the petzl for a few months, probably twenty or so bouldering sessions on it so can't comment on long term durability but so far it's holding up well, my one worry is the zip which holds it folded. However the guy in the ship I got it from said he hadn't had any problems with the zip after a couple of years of use.
Overall I think it's a good mat and I'm happy with mine and so far haven't had any regrets.