I've done it twice. 4 years ago, and 2 weeks ago.
The first tour was great... the second one, not so much.
The first tour took us up ramps, down stairs, over the trains near Germany, through the gardens in America... and so much more.
The second tour was a big let down. We traveled around some of the countries, but not through the obsticle course type tour that I so enjoyed the first time.
It's a great time either way. I also want to do the FW tour.