I recently put a set of Hyperpro shocks on my R1100GS. Here's a crosspost from my experience with these shocks from advrider:
I have some kilometers now on them (about 1200 German Eiffel km's). After fitting these shocks at first they were some kind of a disappointment to me. I like my bike to be low in the front (lowest preload), and a little higher at the rear, which makes turning in easier. Anyway, when I fitted these shock I first made sure they were adjusted to their stock settings (which can be found on a sticker on the wooden crate they ship them in). Which is on the front shock 10 mm. preload, and rebound 28 clicks open from fully turned in. The rear also needs 28 clicks on rebound, and the preload can be adjusted by means of a hydraulic preload adjuster, which I left on "minimum".
When I sat down on my bike it felt a) higher and b) softer. Bummer! I removed the front shock again and changed the preload from 10 to 2 mm because it surely was the front that was higher. That changed things. I took off for my first ride not actually knowing what to expect. I knew it would be firmer that those stock worn-out ones at least. Well they really were! But the bike was dancing and bouncing like never before.
What was most noticable is the fact that the bike would bounce-up, instead bottom-out. Time to dial-in the rebound damping. And this is where these shocks really shine, and most other quality aftermarket shock just as well I guess. There is so much difference between two or three clicks on the rebound damping dial, you just cannot believe this!
My perfect settings turned out to be 22 clicks open on the front, and 18 on the rear. Rear preload not touched. The bike is much more stable on "wobbly" roads, it just dances to the tune of the road, instead of bouncing around and bottoming out on the rear. The front is perfect, the rear is much stiffer. Very much suited to a fully loaded bike, or driving with a passenger. Which the stock spring definately wasn't. Rear spring preload only has about 10 mm adjustment, whereas the stock spring has about double that. I doesn't need more. Because these springs are progressively wound, you get the funny sensation that very small bumps are soaked-up by the suspension as if the suspension was very plush, but bigger unevennesses (is this English??) are treated firmly.
I topped my bike off with a shiny brand-spanking-new stock exhaust I found somewhere, I am a happy biker (sorry guys, but I hate to be stopped by the sound guerrilla in Germany. And why should I bother someone else with my hobby? Loud is out and I'm driving with earplugs anyway!).