It won the Tony for best musical in 2004 I think, beating Wicked! (which...witch was fantastic)
Think of it as Sesame Street for adults. Puppets and actors (just pretend the puppeteers aren't really there) on stage. Its hilarious but addresses a lot of today's issues. Not recommended if you are easily offended but a must if you like a laugh.
I wanted to see it when it arrived in the West End years ago, finally saw it on tour in Cardiff last year. Would definitely go again. Even got the soundtrack with hits such as 'What do you do with a B.A. in English', 'Everyone's a little bit racist' and 'Schuedenfreude' .
Youtube it. Doesn't do it justice really but its as close as