Checked this out one afternoon on a recent trip to Vegas. I had seen Body Worlds when it came to SLC, and I thought it'd be interesting to see the similarities and differences, especially since my boyfriend hadn't seen either and wanted to go as well.
I thought this was a superior exhibit. Body Worlds seemed to be more about making it an artistic sort of thing, while Bodies seemed to be more scientifically motivated. The exhibit was extremely interesting and informative if you're interested in how the human bodies work. I especially enjoyed the part about the circulatory system and the fetus exhibit.
If you're easily weirded out by things, this may not be for you (they are dead human bodies, after all). But if you're not, and you're interested in biology/anatomy, check it out.