Nils,
Out of over 300 sets sold in over 11 years I have been manufacturing these, I only know of 2 cases where they have been removed. One set here and another from a customer in the USA that I never received back after he removed them.
A guy here in Melbourne fitted a set to a 2006 R1200GS he had for sale to improve the throttle response as he got used to his 2010 R1200GS.
They work well and I am just not sure how to get the benefits over to the BMW riding public.
A UK customer had them almost pay for themselves in one 1,920 mile trip with the savings in fuel and was estatic about the way they work. Imagine the long term savings with the reduced use of fuel.
I guess time will tell.
Let me know how you go with the install and the test ride.