Ive fitted a few of these and they are amazing. The wot feels great. Really speeds up changes and holds boost between changes too.
I do thing they can kill clutches and gearboxes rapidly, but not that harsh on engines. The missfire detection will only come up after a certain period of misfires so just dont hold the launch control on for too long.
If you combine the wot box with the racelogic traction control then you are on to a winner.