They have a terrible history. They confiscated hundreds of thousands from players for betting correlated parlays that their software allowed for a considerable period of time. Their primary form of payment is a max $2500 check and average wait time is 6-8 weeks.
All that being said, they do not have any recent history of actually stiffing, and if you are any kind of advantage player at all, they practically give away money.
If you're just looking to bet a few bucks for fun, there is zero reason to use them.