ahhhh... that is different. Yeah, either paypal takes a while to register with them or something similar. I do use drivethroughrpg quiet a bit, maybe a cool grand in books in the last 6 month (ouch), but i use credit card. Never an issue, and because they keep track of your orders (if you have an account), if I delete a book (or lose my portable hard drive, may it never happen), I can re-download my books. I have also begun using their Print option recently, and the quality of books is good, mailing is resonable considering I'm in Australia and when its not christmas, get my books pretty quick.
That said, havent really used anyone else, so I can't compare.