This restaurant is a heartbreaker. It's got great food and their menu is just good enough to justify the really long wait times between courses -- especially if you are the party ordering a table tasting. It's also really expensive -- $85 per person per table balances out the gigantic 4+ person final course of excellently cooked Porterhouse (the best I've ever had in Vegas) and lobster (which was done great too).
The Pros: The food's delicious and the chefs obviously know what they're doing. The tasting menu is amusing and tasty. The style of the place is very nice, as is Aria in general. People-watching is fun to do while you wait.
The Cons: And you will wait. The service is very slow, even balanced against any tasting menu's normal savor-speed. You'll be sitting there between the amuse-bouche and starter tapping your fingers on the table, wanting more! The music in the place is blaring loudly and it's just Top 40 tunes at 30 decibels more than it needs to be. It makes talking normally impossible. The place is deceptively expensive.
It could be so much better if they killed the rock blare and sped up the service. The food is great, but you can find it a good steak-and-lobster place anywhere on the Strip. All in all, a middling experience.