The print on demand option is fantastic, this made for an excellent supplement at my table. The archetypes range from "middle of the road" to "woah, it can do WHAT?!" without ever being over or under powered. The adventure was perfectly timed for me, as I was running Tomb of Annihilation, but that won't be the case for everyone. The new backgrounds were fine, although some of them seem to imply your character has a FAR more interesting background than suited for a 1st level character.
My only negative impression was the optional rules. They're... not elegantly designed. It's fine, but nothing I'll be using personally.
[4 of 5 Stars!]