Paul Zerdin is the best ventriloquist I've ever seen. But that's not the best part of the show; What's really great is how funny the material is and how funny Paul Zerdin is. Paul is comfortable on the stage and really knows how to have fun with the crowd. He has enough experience to handle when his jokes don't land and can even turn those moments into enjoyable and funny ones (but there weren't many jokes of his that weren't a hit with the audience). The whole show was a pleasure to watch and there really wasn't ever a boring or unfunny or uninteresting moment.
The only downside is that some of the bits he did for America's Got Talent he does again. If you haven't seen him on the show, then you're fine. You can use his America's Got Talent clips to gauge how much you'll enjoy the show. If you have seen him on the show, it really only takes up a small portion of the show so it doesn't matter that much; there's lots of other material to make it worth your money.