SLS is a good hotel, it's got a nice ambiance and does remind me of modern LA or Beverly Hills Hotels, or the W in San Francisco.
The check in process was as normal as any other hotels. The elevators were fast despite others reviews. Only time they were slow was on a Saturday when everyone is using them. But there are 8 elevators.
The rooms are very modern looking and great for a place to stay. If you want a larger room or a penthouse, book one. These rooms are normal sized.
Their theme is classy but ready too "monkey" around. Hence the monkeys all over the place. I thought that's a bit intelligent though. Reminds me of the Cosmo a bit, but on a budget.
Only drawback is they are on the north end of the strip. Until all the resorts are finished in that area, they lack notoriety. Take the shuttle at $12 per day. It's about a 15 min ride to the MGM, so we did that daily and were fine. Parking is easy, the people were easy too talk too, and the staff was good.
All in all, 4/5 ain't bad for this place that is only considered 3 stars. They do well and you get a good experience. I will stay here again and I hope they bring me back.