I visited a friend staying at the Aria. Being new it is very clean, and it has all the state of the art room gadgets - very cool! The hotel also has some great shops and several restaurants. The vibe around the Aria is that it's an adult playground - can't say I saw any children.
My friend reports getting a great rate, and thinking the hotel, restaurants, and gaming were all worth coming back to appreciate on their next Vegas trip. From my walk around the hotel and property, I can see why, if you are looking to try something new while in Vegas, the Aria will not disappoint.