Great views of the city.
Full disclosure: I got to ride for free, and didn't have to wait in line, so for that, it was awesome. However, if I was paying and waiting, I might just go someplace where I can enjoy a cocktail with my outstanding views.
If you're a tourist with a little money to burn, the High Roller is cool. If you're not afraid to take a cab (or you're local), go to the Mandarin Bar or the martini bar at the Stratosphere.