ShowStoppers is a show using show tunes. ALL show tunes. I somehow didn't realize this before coming, and looked at the program in confusion as I was only able to identify a couple of songs.
But the show was unexpectedly great. The musicians and dancers (~30 of each!) are extremely talented, and I really liked the variety offered- despite my lack of familiarity with show tunes. My favorite acts were toward the middle (Anything You Can Do I Can Do Better, Wilkommen, Big Spender, NYNY), but others really highlighted the talented singers (Nobody Does It Like Me) and great set (Cell Block Tango)!
I can't say this is a show I'd necessarily see again, but it definitely was better than some of the reviews led me to expect. Note that the song listing changes regularly, so you may get a different mix of performances.