Hey guys just wondering what your thoughts on these are?

All info is here http://www.gizzmoelectronics.com/product_launch.htm

Im just thinking it would be pretty good to just hold the throttle flat and it will keep the revs at 4500 rather than looking at tacho and trying to hold it or keep reving up and down!

Now will this be bad for the motor and or gearbox?

Im not looking to flat change either just want it for launchs.

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M POWER