I have D2's aswell, and from goes in other DC5's and passengers im finding them to not be all that much stiffer than the stock suspension, they crash about a bit on pot holes and speed humps, but there not too bad overall...
I run my damping reasonably stiff now aswell, about 16 clicks front and 24 clicks rear.
Only problem with them as said is the DC5 kit isnt great, one of my struts threads are shot so its not really adjustible anymore, one of the fronts knocks a LOT (squeaks too) and as mentioned the wet weather grip (both cornering and under acceleration) is plain bad.
Im going to change them art some point if i keep the car, get some eibach coilovers i expect.