We booked the "Jet Luxury" option through Expedia. It seems that these are privately owned units that the hotel also rents. The check in process went smoothly and the staff was all great. Note also that valet parking is included if you book through Jet Luxury.
The room was clean and comfortable. The building is only a few years old, so everything was in great shape.
There are some good choices for higher end dining at Vdara and Aria next door.
A couple of minor things to be aware of:
1. It can be tricky to find the valet area the first time. The entrance is about 3 stories above in a very cramped and busy roundabout, and there is an entrance ramp off of Harmon that could be marked better.
2. Vdara and Aria are both set back off the strip a fair distance, so it's a bit of a trek and a confusing path through the Cosmo's basement to get there. Being off the strip was nice, though, since the kept the obnoxious drunken tourists away.
I would definitely stay here again next time I'm in town.