I have them on my 172 mk1, I noticed the following:
the car looks MUCH better, it sits about 30-35mm lowered than before
a MUCH harder ride, you really lose a lot of comfort
better handling due to far less body roll, the car feels a lot more comfortable cornering under speed, however, I am on a track day in 8 weeks, so can report back if they really are better under extreme conditions
hope that helps.