I have sold like 12 shifters to different friends.. and had QS since 2008
best... but like Archer said you need to start with it from the beginning is the Race Tools. functions and sensor is best.... I car hit me on the side of the sensor, bent the rod, and rearset broken ... and sensor works fine, never missed a shift. Sensor ir a Cordona one WSBK shit.
Bazzaz is next in smoothness, functionality but sensors can go south even when new... their customer service is A+..... replaced lots by warranty (both the new and the old style)
Dynojet... not so smooth, but sensor is more robust, still not at the level of Cordona, and you have to buy lots of shit to put it to work
Annitory, smooth but quality is not there with the others, but cheap. you get what you pay for. have seen ones last 3 months and another last 3 years
healtech... installed one, need some fine tune to work since the bolt that holds the shaft and the lever is the sensor...