I am in love with so many of the OAP classes, but this one is the next on my list to play, absolutely! I love the story this tells, the way it all works, and how much fun it just seems to play this class. It is so incredibly creative, and avoids my biggest pet peeve in 5th edition classes: restricted imaginations. You can make so many different kind of characters as an Emergent, and I am in love with it.
Absolutely, 100%, buy this class, add it to your game. It is in no way overpowered, incredibly well balanced as an "options" class to be tailored to fill any hole in a party. Cannot recommend enough.