I had one of their units on a BMW. The older 1150 series BMWs tended to surge at lower throttle settings. The Techlusion (same unit made by Dobeck and rebranded) works similar to a Power Commander by adding fuel. Not nearly as comprehensive as a Tuneboy but they work as advertised and the support is very good.
I have one if you want to try it out. I keep it for tweaking tunes as I go along the learning curve. it has a startup schedule for it also.... give a call if you want to try it out.....