There's probably a few folks that would disagree with you there...I've had both in my Mustang...factory type tracloc limited slip with clutches, and Auburn pro series limited slip. They both worked great in my car. Funny part was the Auburn was in a 7.5" factory rear-that thing took a helluva beating...I kept expecting the pinion to give up.
The factory tracloc in my 7.5" spit out the spider gears after a couple hard launches at the track, but the Cobra spec one in my 8.8 with carbon fiber discs is a brute-that thing has some beefy 31 spline side gears and spiders...and it only costs like $250 new...so if there's anyone wanting a cheap and easily upgradable rear end, an 8.8 is a great way to do it...
Sorry...didn't mean to ramble :D