Actually read both books (My Friend Leonard is Part 2), and enjoyed them. Now think of them as I do most memoirs, as works of semi-fiction (see Augusten Burroughs). After reading many memoirs, I realize that many are at least 50% bs.
Currently reading the new Eggers book, which is billed as fiction, but is really semi-biographical. Its a really great tale of one of the lost boys of Sudan and 100% of all profits go to a foundation in the main characters name, so he's def. real. But Eggers decided to call it fiction b/c its based on interviews.
It all depends on how you bill it I guess.