Not having a lot of experience with exploring the relationship between ride height and progressive rates in a system where the ride height adjuster is part of the progressive rate linkage, my concern is with traction. I can't help but think that "something has to give somewhere" in terms of the shock's compression/rebound travel in a system which AFAIK, is designed to compress and rebound from top and bottom at the pivot points, as opposed to bottom only like conventional set-ups with one point fixed.
AFAIK, the ST3 frame is the same as or descended from the 851, and has fairly steep geometry for a ST, 24 degrees, same as the ST4s, so, there doesn't seem to be to many complaints about rear slides, *or* (amazingly) tankslappers from that crowd, who mostly rave about the "balanced handling" once the rear's jacked-up a bit, and I guess one should trust the factory re possible safety issues, ie they wouldn't have one if it posed too much risk, right?.
Now, another issue: It's money spent, but no bling factor. But not too much from what I understand, so, I may add it come spring if I can find a good alternative to Ducati's higher priced version.