Greetings and Salutations my fellow GT Riders!
Shock Brands and preferrences; more than often, seem to be Subjective as opposed to Objective.... Everybody grew up with our favorite brands of Shocks, Dampers, and Cushions.....etc., etc.
As we came from a "United States" Motorsports Background, the only time we even heard of YSS, was for the old style of "Coilover" Shocks used on antiquated dual rear shock applications. Examples were typically Older Japanese and British biles including Yamaha and BSA..... YSS was the only company (way back when) I could buy an aftermarket shock for a motorcycle with nearly a 1 to 1 ratio of Shock to Swing Arm travel.
With So many Baby Boomers and X Generaton folks reliving they]re youths, (and restoring old motorcycles) there are several companies have stepped up to the plate, including Progessive, Penske and Cannon Custom Spring Companies. These products are for the "Classic" motorcycle enthusiast to locate a shock in the proper spring rate for the intended use of the motorcycle and style of riding. The Original "Goldwing" 1000GL is nearly impossible to find an aftermarket, quality shock...... but YSS fills that "Void".
Observations: Although we do not sell YSS shocks, we have taken the wait and see attitude, with regards to Quality Control to Ratch up a bit, before installing them on any of our customers bikes. All too often we come across soft and hard failed Products from YSS and hope they continue to strive for higher quality and dependability quota in manufacturing.
Our two cents for what its worth.....