Archetypes of Eberron is really good.
I'm a game designer for 5E as well, and there are some archetypes that are so good that I wish I had created them! The artificer's War Weaver, the Rogue's Divine Sniper (my favorite here) and the Druid's Circle of the Storms are some of my highlights from this supplement.
Overall, this is a top notch product for those who would like new subclasses, even if you're not playing on Eberron! There's a lot of to go through here. The layout and editing of the document is also very good, and the subclasses' features are easy to understand on the first read.
Finally, I would make minor changes in some features, but that's my preciousness as a designer.
Just get this!
[5 of 5 Stars!]