I've decided to go ahead and start logging my Vegas hotel experiences. I've been in a lot of them the past few years and I usually try different ones based on what deal I can get and where I have and have not stayed.
The Aria is extremely modern and beautiful. Years of smoking in the older hotels tends to make the hotels smell a little but it looks like the Aria was designed to inhibit this. The casino itself has high ceilings and is insanely beautiful. When you walk in there is a whiff of vanilla to greet you and leave you with a nice impression.
The rooms themselves are quite nice. I think the cheapest I've ever found on a busy time was about $125/night, which isn't bad considering how fancy the room is. There is a $25 resort fee which is annoying but I really do use the wifi and it's included so I'm not complaining too much. If I went to a Harrah's hotel with no resort fees, the wifi is like $20/day. Might as well pay the extra $5 and get full gym access too with all the bottles of water I can bring back to my room.
I've only stayed in their basic rooms but they are still super nice. When you walk in, everything powers on and everything is controlled by a touchpad that sits on your nightstand. Bathrooms super clean and everything just has a nice touch to it. The beds are something I just melt in...I've never had a rough time sleeping in an Aria bed.
I've never had an issue with customer service at this hotel nor really any problems whatsoever.
I dinged a star because it is somewhat pricey and the rooms are VERY far from the elevators. It's a good 3-5 minute walk in some cases from the elevator to your room and it's easy to get lost.
Much like every Vegas hotel, look for a deal online somewhere if you decide to book here.
edit: Crap forgot to review the buffet.
The Aria Buffet is quite nice. I've only had it for brunch but it's about $35 (pricey) but they serve lobster and all sorts of seafood during the brunch buffet too so I'll deal with it. I've never really had anything awful from this buffet so I think it's worth it.