To get right to the point, I really enjoyed this book. Lots of decent options as well as ones that are very much in the flavour of Eberron. In general I thought most of the subclasses were pretty balanced, with a few exceptions, most notably in the Extreme Explorer ability, "Better Lucky than Good", I keep wondering if this ability is always active or if it is certain number of times per day or what. It seems rather ridiculous of an ability if it is an infinite use ability, basically always having max damage and advantage on attacks and ability checks. Otherwise, my only request is if there was a way to get a subclass for Edgewalker, probably one of my favourite themes from Secrets of Sarlona and, a subclass for Alchemist Savant (honestly, a conversion of all the Dragonmarked prestige class would be fantastic) would be great. Either way, I still really liked this booked and have it as resourse for my players.
[5 of 5 Stars!]