Surprised about the responsiveness but not at the ride quality. With the stronger cords on the GT4 the ride would be a bit harsher, but since the cords combine radial and bias it should handle better. Either way glad your happy with it keep us informed.
I know Robert, it's very crisp...note how it's more rounded then the GT4. Incidentally, it should be noted that when I questioned the GT5, I received no definitive reply as to if or when it will be available.