I'm having real problems with Ziftr. After buying some coins in the presale I wired money for payment, and it was never credited to my account. I had to e-mail three times to get a response, basically amounting to "we've had a lot of purchases, we're busy." Okay, but now it's over a week since I've wired the money, and since then their entire website has changed and there's no longer even a place to display a balance anymore to confirm whether or not you have one. I've e-mailed them about this but again am not getting a response.
I don't know if they're a scam, it's possible there are legit explanations for all this, but I'm getting skeptical.

tl;dr Ziftr will not credit my account with payment, and can't really give a satisfactory explanation as to why.