Endzeitgeist has just posted a review on the Tabletop Library site. This is actually rather important, in my view, because Endzeitgeist is known as possibly the pre-eminent reviewer of Pathfinder books, not old-school rule sets. So this represents another step into the mainstream gaming audience for old school rules. Obviously, that march has been going on for quite some time, but this represents a new piece of the mainstream terrain.
I've linked to the page (you might have to hit the "reviews" tab to see the review. The pdf is free, and if you haven't taken a look at these rules, I encourage you to follow Endzeitgeist's advice and do so. As he points out, this is Original D&D (as close as you can get, anyway) in a codified and re-organized format.
While you're on Tabletop Library, browse around and take a look at some of the other products, too. Publishers get paid a higher percentage here than they do at the big competitor.