Piaf, the musical

After I saw Tomate's yesterday post in the forum about the Edith Piaf movie with Marion Cotillard I noticed that they are currently having a musical about her at L'Olympia, one of the most famous music halls in Paris. I haven't seen it and I won't because I don't feel too comfortable about this. I can hear the producers say "hey, the film was a big hit, let's do a musical now!" Maybe I'm being too French! Anyone has seen it? Is it good?