Not me either, but the guys at Car & Driver just installed one of these kits on a long-term test car, and had very good luck with it, although they do make the point that opening the door takes two motions instead of one, along with about 3 seconds more time to get in and out of the car.

The one they used was not a universal - it was specific to the model, and they warned about not using universal kits, which of course, aren't.