Of all the restaurants in Vegas, this one is the most unique and memorable for me. I have been here around 15 to 20 times and nearly every time I go I bring someone new to experience it.
The top of the word is a high class restaurant that rotates around every 80 min or so and gives you the most spectacular views of the city. You should make reservations and request a window table.
If you want the most spectacular views then plan a dinner there so you can see Vegas in its full luster with everything lite up but plan on spending about $100.00 a head which is well worth the experience. Trust me. The food quality, presentation and views are all 5 stars.
There is a secondary plan that I exercise often and that is a lunch date. Again, make reservations and ask for a window table. I typically go around 11:30am and they have a killer cheeseburger as well as a large variety of lunch items like salads and sandwiches. The pricing is more reasonable (like $20 for a meal) and you also get free admission to go up on top and ride the many rides or just continue your time taking in some additional views and pictures.
So, let me repeat. If you only have time or money for one "special night" then book your lunch or dinner here. This is a lifetime experience that you will not soon forget.
I have to update this only because the pricing for the lunches has escalated just a bit. The burger is now $26 and most all of the meals are $25 to $40. Even the grilled cheese is $25, albeit I'm sure it's huge. Even at that this is still the best view in Vegas and worth it.
Enjoy!