I have JRI A's. They're only adjustable with regard to preload. They're 12" (bolthole-to-bolthole) shocks with a little over 3" of travel. They are compliant but don't bottom out. They do lower the bike a little versus the stock 12" airshocks, but the ride versus stock is much 'smoother'.
If I had it to do over, I'd probably get the JRI-B's--which have a rebound damping adjustment. I had a set of Ohlins (3-3s) with that adjustment, and the ride was very good.
My limited experience is, the more settings a set of shocks have, if all things are equal (spring rate, etc.) the better you can dial the ride in, and the better the ride. But all those settings come at a cost. The Ohlins were eight-hundred-plus and the JRI's were a little less than six-hundred.
Alan