I have the gsg sliders as well, and heres a question. Do they have value if we still end up with scratched plastic? Yes, the damage might be less, but a repair is a repair. I believe the gsg's might have value in a higher speed incident in keeping the frame off the street, but not much in the low speed things.
I dont have the guts to remove mine. Thats asking, no begging, for a tip over to happen.