My boyfriend and I were down at the Rio to see Penn and Teller, and decided to eat at this buffet because we were a bit pressed for time. We payed the $10 extra to bypass the line, but still had to wait in the line of people bypassing the line. Well, at least we saved some time.
This buffet is almost overwhelmingly huge, so if you're into options, this is your place. I found that the stuff to the left of the dessert area was a lot better than the stuff to the right for some reason. Some highlights: the prime rib, sweet potatoes, and the sushi (small selection, though). The Mexican food section looked straight out of Golden Corral, though, and the wonton soup I got from the Chinese section was kind of average.
I left feeling satisfied, but not amazed. So it's a good buffet, but still a buffet. Next time in Vegas, I'll try one of the others to contrast and compare.