On the other hand, are these guys storing my wallet safely? How about my balance (please god, don't store it as a float)? How about my password? If they're not launching with two-factor auth I won't even give it a chance (and likely ever, honestly).
I've gotten progressively more and more pessimistic about these sorts of sites even though I like the idea of BitCoin as a currency. If security isn't heavily discussed and visible (2FA, do it!) at the launch, it will be hard for me to take this seriously.