Old School informed GURPS Dungeon Fantasy gaming. Basically killing owlbears and taking their stuff, but with 3d6.
Skimmed what felt like important things. I'm currently beyond impressed by the quality of the layout and design. Also, I'm glad they went with a different character sheet.As far as deep reading - not done yet, but what I have skimmed seems great. Admission of magic items being too expensive for everyday barter, non-humans aging as fast as humans up to late teens and some other things that elude me right now all left a good impression.
I am enjoying it so far, It seems to be doing a nice job of bridging the gap between the various editions. :)