The arcade with all of the Bemani games at the Adventure Dome in Circus Circus was pretty much rented space from a local arcade owner. He decided to close the arcade and sell all of the machines in May of this year, I believe. I heard about this a few couple of weeks after I got back from a trade show out there. I no longer have anything to look foward to when going to Vegas next year.
The Gameworks is kinda blah. It's kinda dirty and usually not very busy. Last time I was there they had a GF1 and a DDR Extreme. I had to wash my hands after playing a pinball game.
I would be happy to know of places near the strip with Bemani games for me to check out next year (since I am guaranteed to work at least one trade show a year in Las Vegas for the rest of my career.)