It depends on what you're looking for. If you want a deep, character-driven novel about the inner lives of comedians, then it's probably not the best fit. It's more of a fictional oral history, a collection of interviews and anecdotes about a fictional comedian's life. The humor is often dry and comes from the absurdity of the situations and the clashing perspectives of the people telling the story, not from traditional joke-telling.
I picked it up expecting something like a novelization of a Judd Apatow movie, and was initially thrown. Once I adjusted my expectations, I found the structure clever. It mimics the feel of a documentary, with unreliable narrators and messy truths. It's not laugh-out-loud funny on every page, but it has a cumulative, wryly observational humor about fame, memory, and the comedy industry itself. The ending, where all the threads about the comedian's final, mysterious project come together, landed perfectly for me.