I saw it back in 2012 in Toronto. I have no idea if it has been reworked since, so take my comments with a grain of salt.
As someone who was absolutely obsessed with Rent in it's prime, it still holds a very special place in my heart - so much so that I already have my tickets to see Rent again at Stratford Festival (Ontario, Canada) this summer. I say this to make it completely clear that I am very biased towards anything related to Rent. Consequently, I absolutely lapped this show up, and went back to see it again. I enjoyed hearing the behind-the-scenes stories of his first impressions of Rent and the original cast members, the early days of the show, and the shock of losing Larson, from someone who was actually there. To me, it was interesting to hear him retell his experiences of the joy of being part of an unprecedented theatrical phenomenon at the same time as going through a tragedy in his personal life across the country.
One of the other posters here commented that he's not a great singer. I felt the opposite when I saw this. He sang a snippet of One Song, Glory and I thought to myself that I never realized he was such a great singer. Thought I guess a lot could have changed 11 years and one pandemic later.
Some of the other commenters seemed to feel that it was self-indulgent "woe is me" tripe. I can totally see where people would get that from. It did seem a little self-indulgent that he thought he was important enough to write a memoir and a show about his experiences, but then I found out that he was approached and asked to write the book, and then to turn it into a show. Just something to keep in mind but I don't know if that changes things for anyone.
So anyway, in a nutshell, I'd say that it's worth it for Rent (or Rapp) fans and anyone who enjoyed the book, but general theatre-goers who don't fit into those categories may not care for it.