I'm running FK PowerTech coilovers.. discontinued but probably the best of what FK made for the MKIV VW. Quite nice considering most coilovers for VWs don't even have dampening adjustment, but these have it all. The spring rate I am quite unsure of, but they are a linear coil so always better than running progressive anything(apparently they don't disclose springrates to public, but I know it's around 400+lbs from previous research). In my opinion I'd say they're not soft by any means, but definitely not terribly stiff. The dampening alone can make a big difference in the behavior of the ride, but in comparison to all of my coilovers, they're probably the softest thing I've driven on. In my Corolla I was running 8kg front and 7kg rear(roughly 480lbs and 400lbs), which is pretty stiff for a car that weighed maybe 2000lbs?
I've made a couple trips to Hocking Hills at my current lowest point and had no problems getting around, just a little rubbing on high speed turns where there would be more Gs.