I had the Dynojet. It worked fine but I too had many mis-shifts. The reason I think this is, is mostly from pussy footing the shifter. Racing, or at the track I suppose, you should be banging away anyway, right. The first mistake I noticed was the resting of my toes on the shifter. Any pressure would cut the engine, as it is supposed to. Once I started paying attention to my shifting technique, I realised it was mostly my fault, the problems I was having with the QS.
I dropped quite a bit of time with the addition of the QS but also lost a few positions a few times because of false neutrals. In the end it gave me one less thing to worry about as far as controls went.
I think they are a waste of time for the street and only needed for the track for racing or the guy that really challenges himself to make better lap times.
The fastest guys in our club rode the BMWs last year. Some guys went through a few trannys. When they went to the HM strain gauge type, that sorted the problem. They were using the stock QS before.
As far as how my tranny looked after the use of the QS? I don't know but I hope the thing exploded right after I sold it to that SDeric douchebag.