i run the tko500's predecessor the t-3550 but have upgraded it to larger output shaft and 26-spline input shaft as the tko600. its a good tranny. rarely break and stock like drive ability.
i have the first Gen. TKO (the one before they put the "500" and "600" ratings after them). I love it.. My factory T5 was making
so much noise, so i bought my setup off corral. The pros: strong, easy to use. Cons: a little bit of noise sitting at idle, and
5th gear is noisy.. it is a badass setup though.