Here's my experience...I used to play at alot of the Mainstreet group casinos and did very poorly. Last June, I won a random jackpot at Sunpalace. They stalled the payout and I foolishly played it back. I got an email from their cashier after that asking me how I would like the money paid out.
After that, I closed all accounts there and to this day never returned. They are slow to pay and got unaccredited at CM. Personally, I think they're having financial problems because they also were not paying people stating they were some part of a "gambling ring". Again, another casino stating fraud without having to prove anything.