Since most of the tunes are linked back to this site it is safe to say most of the people have found it or know about it. In fact, there is already a thread on it...
From what I have found, the tunes are all good...or I should say better than stock. They address some of the quirks of each car but like most tunes, are only specific to certain tracks and/or driving styles. Use the tunes as a starting point and adjust for your needs.
