I was there about a month ago and the only place that that even resemebled a good pen and good game was Beau Rivage. The dd looked like about 60-65% pen. It used to be a really good place to play with s17, but now that the dd is H17, it is just ok.
every place else I observed, the pen is just downright horrible- Isle & Hard Rock- less than 50%. Imperial Palace right at 50% pen. Island - 50% pen.
If you are low stakes consider Treasure Bay. At least they have s17 with RSA. Great rules, mediocre pen of about 50% pen. Probably need some cover or low stakes to last if you are good.