How triggering or unpleasant is Matthew Perry’s memoir, ‘Friends, Lovers and the Big Terrible Thing’?

I recently listened to Britney Spears’s memoir in audiobook format and liked it. I am thinking of listening to Matthew Perry’s memoir, but have some misgivings as I heard some negative reviews of it.

For those of you who have read the memoir or listened to it in audiobook format, did you find it unpleasant? Given the subject matter (substance abuse and addiction), do you think that the book will be triggering to a reader or listener?

by abacteriaunmanly