Completely inspired, well-constructed, mandatory reading for my tables now. Only serious flaw is that it only includes the standard races, a flaw which is fixed by their other volumes, and by the instructions given to apply the practice to other races.
I'm writing on Black Friday Weekend. If you can pick this up for $5 you're getting an absurd deal. For comparison Tasha's is 10x the price and I would say will have noticeably less impact than this volume on all tables that run them, except those that use an Artificer (and even then, it's comparable). Tasha's gives a few variable class features and cool cantrips for some characters; this volume will transform how you approach character creation every time.
[5 of 5 Stars!]