When I got my stock gears back from Wavtrac they looked really good, but my car only had 24k miles on it when I went to the Wavetrac LSD. These cars make enough power from the factory to warranty a real LSD as one of the first mods.
The best comparision I can make between the stock open read end and the Wavetrac is my burnouts at the track. I do a perfect, 2 wheels burnout now and the car stays put with no side to side movement when letting off the line-lock and rolling out of the burnout box.