Having grown familiar with 800 Degrees Pizza in LA, I was intrigued to try the location in the SLS. Granted I visited right after the SLS first opened, so some of my comments might be a little outdated.
The seating is far more cafeteria style than the LA locations, and I could see how things could get a bit tight if there's a crowd. It's also totally open to the gambling floor, which depending on who you are can be a good or a bad thing.
I have to say that the pizza was made perfectly, the employees were friendly, the entire place was spotless, and the biggest improvement from the LA location was a lack of rushing. This location really allows you to enjoy the experience.