I've had both the off the shelf replacements and now have the KYB shocks.
I'd also call the KYB's firm but not harsh on a standard road. Drive those same shocks on a road that has tons of cracks or major imperfections, they feel even more like a performance shock, but you don't fly down dirt roads in a sports car do you?? and NO I don't believe that the Duke boys used KYB shocks, although it would have been a great ad campaign...
I personally think that they're the best bang for the buck, but then again I've got big wheels and drive my car like a go cart :lol: ( see post about cracked k-frame #-o )