I use B&M Trick Shift. My transmission is a B&M 727 with a custom torque converter, that is mounted behind a 1000 hp Indy engine, and the Trick Shift works extremely well. Zero slippage with solid shifts... no jerking, just solid shifts. I also have the Gear Vendor unit mounted to the backside of the trans for overdrive and gear-splitting six speeds for the track. I've been using this product since 2015 without a single issue. Because of the aggressive driving exposure, I do change the trans fluid annually.... just to be on the safe side.
PS: since adding the Gear Vendor setup, I've shaved off a full second on ET (best time on "California" pump gas is 9.62). Still toying with trying nitrous or racing fuel... however, not sure it's worth the risk!!! So far, the entire drivetrain seems extremely solid.