I've had the HO322 Ohlins shock for a couple weeks now so I'll post my thoughts so far. I'm no expert with suspensions so I guess take that into consideration. I've also only had a chance to go on a few real rides so far, in addition to my very boring daily commute and some shorter rides in the evenings, so I'm still getting accustomed to how the bike handles now with the Ohlins.
The seller said that the shock would be resprung and revalved for my weight (165 lbs w/ gear) and I have to think they did a nice job with that because after I installed it and before I started messing around with the preload or rebound damping, I made some measurements. Free sag was right around 5 mm and static sag was right around 30 mm. I say "around" because I measured without backing the clicker all the way out, which I understand now isn't the right way to do it. Also, I'm measuring the best I can with my wife's help and my numbers could be a little off. Anyway, I did a few days of commutes and then took a ~120 mile ride with the "default" out of the box settings over some of my favorite back roads with a good variety of road conditions. I should also mention that I returned my stock front suspension to the factory defaults for preload and damping. My feeling was that in the smooth stuff to moderately bumpy, the bike was handling and cornering better than ever. In the small bumps that would have been unsettling with the stock rear shock, the Ohlins just chewed them right up. It was really night and day.
Where things weren't so good were when I got to some sections with really bad frost heaves. I'm talking about those nasty raised sections that run across the whole width of the road, almost like a small speed bump. If you live in the south you might never have seen one!
Anyway, with the stock shock these would often toss me right out of my seat and unfortunately, with the Ohlins I was getting tossed out about the same. I was hoping that the better shock might be a little more forgiving in these sections but I really don't feel like it was much, if any, better with the out of the box preload and clicker settings.
I thought the first thing I'd try would be to back off the preload a little. I did that and re-measured (with the clicker backed out all the way this time) and I got 8mm free sag / 38mm static sag. Again, I don't promise these numbers are perfect. I've ridden another couple hundred miles with these settings and I feel like the bike is handling just as well or awfully close in the smooth to moderately bumpy stuff. If I've softend it too much, I'm probably not riding aggressively enough to feel it. It seems to soak up some of the rougher terrain a little better now too. The real test will be this weekend when I can go back through the worst section I rode before and see if I'm still getting launched out of the seat. Just based on how it feels right now, my guess is the worst bumps will still toss me a little but not as violently as before. Maybe someone who knows can tell me if I'm on the right track, but my feeling is that I don't want to add any more sag and possibly degrade the performance for 99.9% of my riding to improve the 0.1% over the god awful frost heaves. I could play with the rebound damping a little (I'm right in the middle at 15 clicks) but it really seems to be soaking up the small bumps perfectly as is.
I'll be upgrading the front springs soon (sitting in a box in my garage right now). I don't feel like the stock fronts are really all that bad right now, at least compared to how the stock rear shock felt. I imagine that's because I'm a lighter rider and the stock front springs are only a little undersprung for me, while the stock rear was way oversprung for almost everybody. But the front springs are cheap so I figured I might as well get the front set up right too.