I to have an ATS (tany w/valve body,TC,commander) and have nothing but positive thing to say about it. I had mine installed by TST, and the 100 mile drive home after the installation was the best ride I'd ever taken in that truck. It's one of those "you have to experience it, to appreciate it" type things. I could type you a four page report, and still not do what a 5 mile ride would. The ATS is firm, but smooth with it's shifts. Nothing real harsh, thou if you really get on it, the first to second shift at full throttle will get your attention. I enjoy the TC being locked up sooner, and on costing, you can really feel it hold back now. I would recommend you budget in a pac-brake (or what ever you want), it works very well with this transmission and the commander control unit. It's a huge step to make, but well worth it. You can make a ton of HP, but it is useless with the stock trany, it just doesn't get to the ground. I would buy this thing again, with out hesitation.