Remnant says:
Tell me if Power Nexus is something I should purchase...I've got this book, by the way. I think it's super helpful to me as a GM, but I don't think it adds value to a player. There's a couple more character races in it (none of them particularly speak to me). The new equipment is all either artifacts (e.g. something players probably shouldn't get) or non-Force items (e.g. it doesn't have a bunch of new lightsaber mods, etc.). And there aren't any new powers or insights into the Force, per se.
I've used it extensively to model the tests you guys are going through, but as a player -- I don't think it's worth the $$ unless you intend to GM Force and Destiny one day.