I enjoyed it - the wait time was pretty much non-existent even though they were only running 2 of the 4 simulators. 10 minutes wait, tops. Designing was fun, but for me a big draw back was that you can not go back if you change your mind on a design choice... so choose carefully the first time. Other than that I thought it was pretty cool, not a totally exhilarating experience but definitely worth trying.
That is unless you are even slightly claustrophobic haha...you have less moving room than Mission:SPACE!