That said, this is my first OotS book, is the material/ink quality of this one comparable to the others? It looks and feels quite a bit nicer than what I was expecting. Naturally, I haven't been able to read it yet, though.
I don't actually have this book yet, but I've been consistently impressed by the quality of the books, so I imagine yes, they are all this good.
I am willing and able to evaluate and critique homebrew material. PM me a link if you want an evaluation or a critique. If this applies to you too, put this in your sig.