I feel bad saying this since its about his life but I really didn't like this memoir.
I found it to be irritatingly repetitive and I felt like it was missing alot of meat In-between to make it seem not so repetitive. 
I can say that it has given me a deeper understanding of addiction, so that's something.
Don't do drugs kids.
R.I.P Matthew Perry, may you finally have the peace you couldn't find in life.