This has to be the best add on to a base package game I have ever purchased.
The hype of its release built me up so high and I was not disappointed by it in any way. The abilities it grants you with such as skyscrapers, elevators, subways, clubs, partying, skinny dipping, making drinks, acting, directing, becoming famous and even "woo-hooing" in elevators just make it so much more expansive and fun. I still have much to discover such as the vampires as I have decided to avoid them for now.
Here is my recommendation - buy it and discover it for yourself. This is Sims 3 like never before.