This is the kit I had originally installed in my last trans. It worked very well. the 1-2 shift was a bit harsh at light throttle, the 2-3 was very fast and crisp. under heavy throttle the 1-2 seemed to lose a bit of the harshness and worked very well, the 2-3 was lightning fast and positive. If it weren't for my low roller clutch flaking off some friction material causing my boost valve to stick which caused a second gear flare I think my trans would have kept on going and going. When I had done the transgo it was a fresh rebuild with ck's billet forward drum and some other hardened parts. My directs had shown no sign of wear, heat or slippage with this kit.
Since then I have rebuilt the trans with a dual feed mod and ck's kit. It works as Chris has described on his site. I'm not sure how transgo dual feeds the direct with their kit, my builder blocked a hole in the valve body, removed a seal and did something else which I can't recall right now.