Yes it is high end and expensive, and it is one of the most beautiful shopping spots one could ask for.
The shops are filled with all of the items you need to live the high life in Vegas. The restaurants line the walkways like cafes in Europe ... each one with their individual appeal and specialties. Who would expect to see Joe's Stone Crab outside of Miami? Only in Vegas do you see all of the famous chefs with a restaurant to call their own.
When in Vegas ... it is worth the trip to see the Forum shops. I can usually find something special to make my trip worth while. And if you are into people watching, this is the place to see people from around the world. There is a lot of eye candy to keep you interested.