There are multiple locations on the strip and they always look SOOOO sleazy. I always felt it was like a time share gimmick but I gotta admit, I was wrong.
Ticket prices are on average 25% off of the box office prices and there are even restaurant discounts. We went to Emeril's Fish House in MGM and for $3 we got 25% off of the bill. One small note on the tickets for shows is you have to get there early to get your tickets. Tix4Tonight, you will be visited again!
p.s. Don't be a doofus like me and go to the one in the sun. It's blazing hot and there is one outside of the Coca-Cola World that's nicely air conditioned!