Place is a scam. I was interested in their offer for $20 of free credit. When I asked about it in detail, I found out that you can never technically win that money back: after putting down (and losing) $20 of your own, the credit kicks in, though you can only cash out winnings which exceed $20. The more questions you ask the staff, the more you realize you should stay far away.
Also, people just kind of stand around looking dumbfounded. A man collapsed on the floor while I was looking around, and the staff hardly seemed to care while they called the paramedics, cracking jokes and whatnot.
Just for good measure, most of the in-casino shops don't take American Express.