I have one, and is the only one I will ever run. I installed one on an 82 GT as well. I don't like coilovers for the fact that it puts the vehicles weight on the top of the shock tower. They are very nice. The only thing is that the nuts for the control arm bolts have to be ground down in order to fit.
I don't know much about the details of them. But does anyone know if it moves the arms at all from stock location. I know some brands do and some don't.
In the qa1's case, its the tubular coilover control arms that move the wheels forward. Mine and the 82 that I installed one on both have the factory length wheel base.