Exactly what's on the tin. A basic, one-page diceless roleplaying game.
I downloaded this to play a one-shot with a few friends, and it worked out great, though one or two players had trouble with the concept of spending and regaining luck. I don't know if that was my inability to explain it or their inexperience with RPGs or an inability to understand the concept of losing on purpose (which may have just been stubborness).
I have not read System DL; but only because I grabbed this up for a one-shot pick-up game, where we had no dice, and it did exactly what I was hoping.