Great place to shop for M&M stuff. The best part of the store is the free 3D movie. If you have kids, bring them here and they'd love it.
All the products are way over priced, though they have lots of colors and different kind of M&Ms, you're paying WAY too much for something you can get from the store. Which the bottom line, they are chocolate.
Bottom line, unless you're a M&M mega-fan, there are other shopping to go in Vegas and don't waste your time if you need to choose between this or something else.