I installed h&r lowering springs earlier this week. I got the 1.2" drop but they went a little more than that. Almost like 1.5-1.75" after the car rested a bit in the springs. The links that came with the kit was set to 6.5cm which was suppose to give the rear a 1" drop. Upon Installation, it dropped a LOT more than 1". So I lengthened my links by .25cm more and now it is quite perfect.
As for the ride quality, rear is a bit more bouncy but barely noticeable. All in all, it rides very much like a stock vehicle but remains more flat going around curves at a high rate.
The install was fairly straight forward too. Pm me if you want more info. Hope this helps