See it if you like Berlin songs; you'll hear lots of them (a mix of known/new). You'll also see tap dancing and learn the broad outlines of IB's life.
Don't see it if you need a highly polished evening. The early preview felt a bit raw, although Peterson is talented and the songs are mostly delightful.
See it if Extensive repetoire of Berlin’s songs, wonderfully performed by a singer/actor/dancer and a pianist. Spoken bits of biography inbetween.
Don't see it if You are looking for something more dramatic or moving. I would have liked more depth on Berlin’s songwriting process.