The Signature suite we got -- a corner unit on the 8th floor of Tower 2 -- felt like it had just been redone. Everything seemed new and worked fine. It was also extremely quiet with nice views to the east (away from the Strip). But do note that the kitchen equipment is minimal.
I was nervous about checking in because this is largely a hotel and we arrived late. In fact, it worked out fine and the Signature staff is quite good and friendly even to AirBnB folks. But I think that the key to a smooth check in is making sure that your AirBnB name is your legal name, same as your ID, and it's a good idea to print out their visa form with that legal name and AirBnB confirmation number. Hope sent a lot of messages about check-in but I found them confusing.