Yes, we took our two boys, ages 12 and 15 at the time, for spring break last year. It is both awesome and expensive. Our boys loved it. We tried to eat rather cheaply, or at least as much as possible. What kind of information do want? Where to stay? Activities? Where to eat? How old are your kids? I answered a similar question probably during the summer if you want to look back at my old answers or archives. I think I might also have asked a question about Atlantis on this site before we went. Feel free to PM me with specific questions.
ETA: hope this isnt a duplicate. I started typing an answer and then lost it. The hotels/towers vary by price and quality. The Royal Tower is the main tower and the most centrally located. It is closest to the waterpark and contains the aquarium know as The Dig.
We stayed in the Coral Towers, one step down in quality and about a 10-15 minute walk from the waterpark. The location was perfect for us. We had our own pool area, which wasn't as crowded and we were 5 min. from the Marina area where we ate most of our dinners. It also contained the teen nightclub for our older son and the remote controlled car racetrack. The tween nightclub for our younger son wasn't far away. The rooms were o.k., nothing fancy.
The Beach Tower is about 5 minutes farther away from the waterpark and is the cheapest hotel on the property. They also have their own pool and a little lazy river and overlook the beach.
If you want a bargain and want to stay off property I have friends who have stayed at the Comfort Suites just outside of Atlantis. It offers full waterpark privileges. It is nothing fancy, but was recently renovated and includes breakfast.
The other towers, condos, etc. would be considered luxury accomodations.
Another ETA: I got a small discount on our accommodations through Travelzoo. There are frequently promotions.