I have been to Vegas several times in the last few years. I never miss going to the outlets (north - outdoor). I have been to the other once and it was ok. This is a must if you love shopping and need clothing & shoes! I always go home with at least 10 pairs of shoes and clothes to last me a long time. If i brought more suitcases I would have purchased more then I did.
It's fun and depending on the person you are, you could probably spend a good portion of your day here.