I have only had a few hours to test them, but I am both impressed and a little let down. 1st the car looks much better closer to the ground. Even with stock 16" wheels and tires. The springs seem only slightly stiffer that stock, which was a small disappointment. My Sunfire has the Prokit as well and seems to be much stiffer. Different application I know, but they are the same spring in name.
The sway bars were an eye opener. The first thing I noticed was when I took them out of the box. They were so light I thought they were plastic.

I have Eibach sways on my Sunfire and they are solid and close to the same diameters but much heavier.
As far as the handling is concerned, it is a great improvement. The limiting factor right now is the stock wheel and tire package which I will replace with the next commission check.
Here is the wheel I was thinking about upgrading to. Whadya think?