I was pleasantly surprised by this show. We caught the holiday edition so most of the songs were featured around Christmas.
The singers are really quite good and entertaining. They have a huge group of dancers for most of the numbers, so it was great to see all these very attractive people (most of the time, scantily clad) dancing around the stage. There wasn't much in terms of special effects but they did a nice job with the stages.
The songs they sang are pretty old (Elvis time frame and maybe even older), so if you don't know the songs, it might not resonate as much with you.
They had some smaller acts in between, such as a duo stunt group and the Quiddlers group (you should watch them on YouTube if you don't know who they are) that have these hilarious puppets they wear and act as really short men.