I do not believe they are a gimmick. They seem to do exactly as advertised.
To be fair to sprintbooster it is mostly the users of their product who give it a bad name with claims like improved fuel economy, faster 0 to 100 times etc. I think as long as you realise the module is only doing what manufacturers often change deliberately between model change overs and between different trim specifications in order to achieve their desired "feel" to how the car's accelerator responds to input you will be fine. It cannot magically speed up the data transmission rate achievable between the accelerator pedal, the ECU and the throttle body and/or injectors...only adjusts the actual data being sent.
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