Don't get your hopes up too much...this is a pawn shop just like any other except this one happened to get a TV show. The line wrapped around the building on Saturday when I was in town, but on Sunday there was no line at all.
The pawn shop has a bunch of super expensive items that you've probably seen on the TV show as well as some standard pawn shop fare: jewelry, antiques, etc. There is also a huge section where you can buy t-shirts and other souvenirs from the show.
Overall it was a cool place to visit, especially if you're a fan, but you won't recognize any of the employees and it's not really a place you'll spend more than 30-45 minutes in.