I must admit that I'm a massive Cirque du Soleil fan, and I've seen almost all of their shows in Las Vegas. I can safely say that this was by far my favorite out of the 5 or 6 that I had previously seen. It doesn't hurt that I'm a huge Michael Jackson fan, but the creativity and innovation that went into this show is unparalleled, even by Cirque standards.
I obviously won't go into detail to avoid spoiling anything, but I will say that you will continually be saying "that was the best part of the show" over and over. I seriously thought that it couldn't get better at multiple times during the performance, but I was proven wrong time and time again. Please go see this show.
I would strongly recommend sitting in the middle of the arena about halfway up so that you have a full view of everything going on around the stage and not just on it. If you have ever been to a Cirque show you will know that the performance isn't restricted to the actual stage, and this show was no exception. Seriously, go see this show!