Just returning from an awesome family vacation to Chicago. Took the kids to see Blue Man Group at the Briar Street Theater. It was awesome (as they always are) and the kids loved it. If you are ever in Chicago (or Las Vegas, or Orlando, or Boston) and can squeeze it it might be worth it to go see it.
The only downside for me at least is that I had pretty much already seen it all. While they have made some big changes since they first opened 17 years ago they still do the same core acts and songs that they have been doing since day one. If you have never seen them before, go for it! It's a fun, family safe theatrical performance and young kids love the grand finale. If however you have seen them before (even if it was just the rock tour) you won't leave with many new memories.