I can not talk the technical jargon about all this, so let me try to put it in layman's terms.
First, trying to make a paddle shifter work with say a 700R4 would be like trying to hook up a F.A.S.T. computer to metering block on your Holley. The two just do not mix.
Second, I have both a 700R4(in my malibu) and a 4L80 in the goat. The trade off you have in a 700R4 is to get the 1st-2nd shift right, you give up the 3rd-4th shift at the right time. There is no fine tuning the shifts, just a compromise at best.
Now, on the 4L80, Steve has fine tuned each shift point, for each gear change. He absolutely had the laptop on, and adjusted the shift points while we were riding down the road. It was the real time adjustments that made the final outcome perfect. There is no guessing to it, just adjust, with the laptop, until you have things exactly like you like them. Until you have done this, there is no way to explain the experiance. Honestly, the paddle shifter is icing on the cake, but the ability to fine tune your shift is just unreal. Not only can you adjust it to shift at a certain speed, you also adjust the firmness it shifts. Then, if you change your mind, no problem, just retune.
Hopefully, this helps
BTW, if this sounds like a shameless plug for twist machines, it is!
Since I know Steve, trust his judgement, along with the fact that HE is a sponsor here, there is no way I would buy from the other folks, regardless of price. I feel that if there is a problem down the road, Steve can help me thru it, since he invented the technology in the first place.