I have pushed 3.5e, 5e, and several retro-clones on my firends. They now ask for The Black Hack by name. Every group I introduce to this game has a common response: that was FUN!
This is a game to be played. For my taste, many other rules systems are more interesting to read and think about and many other books are much nicer to hold and look at. But no other game in this space has produced such a positive response from my players.
I would wholeheartedly recommed these rules to anyone interested in "D&D" without reservations.
[5 of 5 Stars!]