A few questions about the RS tuner, am I right in saying this is a hand held device that remaps your car? Is this easy to use and can u mess around with different maps launch control pops and bangs and can u reset your ECU back to normal? I would rather this than a company remap as obviously you can reset the ECU for resale and also just remap it for the weekends and stuff ? Or is the device not as simple as that? Anyone with experience with these devices would appreciate your advice thanks.