Go see it. It's quite good and, sometimes, it's terrific. A couple of parts could have been better cast, but it's a play by a wonderful writer that you will probably never seen again (although I hope I'm wrong about that).
This is one of my favorite off-Broadway shows this season (along with The Film Society playing right across the hall at the same theater complex). Who knew that life could be so out-of-control in the 1960s? There are issues with wild late night parties, marital problems, adultery, references to homosexuality, extreme drunkenness, abuse, and many more that I don't want to spoil. These characters play their roles very well, with nuance and perfect acting. The cast is all-around excellent. Many have been TACT members for years and years, and many others have vast Broadway and off-Broadway experience. And the conclusion is something that I still can't get out of my head (when happens when "Momma" comes over). 1 hour 57 minutes including intermission. Highly recommended.