I have.
I haven't been able to really articulate things out to see how they let All but the very last bit of the coil out ......neato.
But the one thing that really sucked about breaking down the front end were those stock coil cups. This HD coil cup is the easiest coil install of all time. Love it, Love it, Love it.
I even switched back and forth between the first generation Duff Variable rate coils and my latest generation Duff Variable rate coils to see how they rode differently from one another.
Great product Mike!
By the way, I prefer the later generation coils at least on the street....the older generation seems a smidge stiffer but that is probably good for washboard and the like.
Love me some Duffs