Just fitted a new Nitron rear shock. The base model NTR-R1 with a spring customised for my weight with gear, no pillion. I felt the base model was enough for the type of riding I do and in particular I don't ever have a pillion and need to make fast changes. I am also not keen on spending money, must be my Scottish upbringing.
Cost £453 delivered, it took a while , 6 weeks, maybe because they they have just moved it is advertised as 2-3 weeks. It looks and feels a quality bit of kit and is definitely lighter than the stock one. Infinitely adjustable for preload and with 24 click of combined compression and rebound damping. It comes with a tool for preload adjustment. Although I must say access to the damping adjustment when fitted is a little trickey.
Took around an hour to fit. I used an ABBA stand and used wooden block uder the tyre to "just" have the shock unloaded. I took the silencer can off as makes access much easier. Pretty simple job except I had to die down the thread on the exhaust clamp captive bolt as it was knackered- will order a new one, and getting the exhaust bolts to line up takes some wiggling.
Replaces the stock shock on a base 15 plate ST which has done 21k. The stock shock was very bouncy the damping was not great even though I had it on minimum pre-load.
After a short test ride with it on the out of the box settings~1hr and trying to be subjective. It is medium-firm but very well damped, the sag(seat is higher) is less than I had with the old shock on minimum. There are plenty of bumps and pot holes in my area and it coped very well. I actually stayed on the seat at all times. It inspired confidence, for now I will leave it as received.