Just came back from a trip to see this show. I had contemplated a trip to Germany in the past to see this - I think it's that valuable. Fortunately, two shows are touring the US (the other is in Cleveland right now), but Chicago has the more famous pieces.They're headed to Toronto and Philly later (see http://www.bodyworlds.com/en/pages/home.asp).
You can also buy a documentary DVD on line for about $20 to check it out first.
To me, this is very important stuff - well worth the effort.