I would not say it ruins the ride, but improves it over stock (depending on what your looking for).
I just installed Eibachs and Deaver +3 HDs 2 weeks ago (purchased from Nick@Apollo-Optics), and just got back from a week and a half trip to Colorado mountains (1200 mile drive each way). Probably drove 150 miles of forest roads, and 50 miles of off-road trails while I was up there. The off-road trails for the most part were too rocky to do anything over 30 mph in some sections, but averaged like 10 mph (lot of 4 low with all the big rocks and steep grades). I was able get some decent speed on most of the forest roads, even the ones that hadn't been graded in a while.
With those springs, the ride is greatly improved. Almost all body roll is gone, and no axle wrap are the 2 most obvious differences to me. The ride is a little stiffer than stock, mainly the rear springs, but with a little weight in the bed, and the right PSI in the tires, it smooths out really nicely, almost as smooth as stock on the road/freeway.
With the stock springs, if I hit a large bump or rut, it was too squishy and would bottom out or tap the skid plate too easily in my opinion. The new springs certainly helped with that a whole lot. The extra ground clearance is really nice to have too, no new scratches on the skid plate since the swap.