Excellent game. I also have the RC and reread it alongside Dark Dungeons. Dark Dungeons has clearer rules and, imho, better organization; but with public domain artwork. I think the only place where it's a toss-up as far as organization, is with weapon feats/mastery: both are okay, and have their own strengths and weaknesses. There are some house rules baked-in, and a few other (welcome) minor differences from the RC.
All in all, a great effort by Blacky! You can't go wrong with DD!
[5 of 5 Stars!]