some forum posters will bash them...I have been with them a while...I have NEVER had a problem with a payout. Their lines for dogs are TOO good to pass up. Some say their customer service sucks...I will say this: three times they have voided a bet for me after I placed it. And I have also always gotten a response from their CS email within an hour...can't say the same for other books.
However, if you have even a HINT of scammer in you, you are in for trouble. They will audit any account that is suspicious, and they may not pay you, no matter who you have vouching for you. If you are on the up-and-up, I don't think you will have any problems