Just want to put this into perspective...As a GAZ coilover user I strangely feel the need to give my view on them as they're getting pretty badly slated on here. Firstly, if you want them to work properly, they'll need to be set fairly hard - about 15 clicks from hardest (out of 42) - if they're not, the damping is far too soft for the springs and the car feel floaty and uncontrollable.
When I initially installed them, I had the rear wound down to the lowest setting, but after finding out that better handling is achieved from having the ride height level, or better still 1-2mm higher at the back than the front, I raised the rear by 9mm. The results were impressive; before the rear of the car would be harsh on even the smallest compressions (giving weight to the arguement that GAZ are indeed sh*t) but now there is far more compliency, and although the ride is firm (there is no getting away from this with the GAZ setup) it is more progressive.
I don't doubt that Leda / Bilstien / H&R are better, but I'm quietly confident that considering the price difference, GAZ coilovers do represent fair value for money.