I've heard so much controversy surrounding the exhibition of Body Worlds at Science World since this summer. I've seen hundred yard long lines waiting for admission in the summer. Never find the time to visit until now.
I'd say it's well presented and well worth my time. There is no time limit on how long you can stay, one to two hour is the norm, I spent 3 hours in there and still haven't managed to dig in too deep. Of course there are rooms for improvement.
A few suggestions:
Visit during early hours when it's not over crowed.
Spend the 5 bucks to get the audio guide.
Skip the OMNIMAX movie.
Don't visit the exhibit if you're sensitive or easily offended.