Last book I used was SportsInteraction.com about 4 years ago. I cashed out, requested a check, 4 or 5 times no problem... Not so fast. After a few big wins I requested a check of approx 2500. I received the check on time and deposited into my checking account. 2 or 3 days later I get a call from my bank saying it had bounced and the funds had been removed from my account. Long story short, it took me about two months, several hundred phone calls, and dozens of nasty emails to get another check that actually had the funds to back it. I was done with online books after that.