This was a great buy. The D&D 5e Player's Handbook is somewhat short on feat options and this book goes in depth from past editions to bring more of the mainstay feats to the fore again. I might not take all the feats, but there are enough in here that you are going to find a number of them very useful and worthwhile. Most notably, I like that they addressed some of the class abilities that a lot of 5e players were critical of. The Beastmaster ranger especially felt a little off, and there are feats in here to address some of those class weaknesses.
There's actually over 160 feats, and for sheer content, this is well worth the PDF price. I'll rate this at 5 stars, because it's a nice looking product that delivers on content missing from the new D&D game. Things seeem pretty balanced, as you need to use your bonus actions/reactions to make a lot of the impressive features work optimally.
[5 of 5 Stars!]