I stayed at Bally's in April 2010 when I went to Vegas with a group of friends and we had a fun and hassle-free experience. We didn't actually stay at the hotel for very long (we were mostly out walking around other hotels in the day and nighttime as well) but it was a pretty decent experience. It's not the best of hotels but it's definitely not the worst either. There is nothing particularly memorable about Bally's but we were treated well and had a good stay.