I was fortunate enough to be invited to the Opening Night by one of the attorneys involved in the production. It was fantastic, and some of the costumes worn by the male audience members outshone the Bob Mackie creations onstage. There were three Cher sightings. As we approached the theater she was giving an interview outside. Then, when the audience was finally seated (about 20 minutes late) and the curtain was about to go up Cher was escorted to her seat to thunderous applause. Finally, after the curtain calls, Stephanie J. Block brought the creative team onstage (including Bob Mackie.) Finally she introduced Cher herself and they sang a duet (obviously rehearsed) of "If I Could Turn Back Time".
The show was quite nice for a jukebox musical and the three Chers worked well together, although Block had the largest role and the best voice. She nailed Cher. The costumes were wonderful. The book is more than little thin and I knew more about Cher from Wikipedia and VH1's "Behind the Music" than from the show. But her point was made, that she had to take control of her own life and succeeded when everyone thought she would fail.
I was invited to the afterparty but didn't go as I had to work the next day and had a two hour commute home.
All in all, the show is a crowd pleaser and should have a decent run.