Keep in mind this is just an opinion. When I was looking at dampers, the GPR unit ran $360, and the Scotts $404. Scotts has recently been bought by ohlins, which are without a doubt the best name in suspension. With only $44 in difference, I saw no reason to chance an unknown GPR unit. Maybe their quality is good, maybe not. I know Ohlins is going to be top notch. (Yes the damper says "scotts" on top and "ohlins" on the front).
Scotts does have adjustments you might never use. So dont use them. It also has a few adjustments that I thought were real cool, such as the ability to set damping only in certain degree range (such as say 20deg from streight, with anything over that being undamped) Which I thought might be real usefull in parking lot manuvers.
Even if setting up the scotts unit proves to be a pain in the ass, its a one time thing. Set it, and its good.
To me there is simply not a big enough price difference to justify taking a chance.. Now if GPR sold for $260, I might be singing a different tune.