I have 9 stage Tough Dog Adjustable shocks, I purchased them new & fitted them to my ST-X D40, they did around 50,000kms (Vic High Country, Simpson Desert, Mungo NP, Abercrombie River NP & more).
I then sold the ST-X D40, removed the Tough Dogs and fitted them to my new ST-X 550. She has now done 10,000kms. 1 Vic High Country run.
I personally love them, they work hard, feel solid when they should. Turn them down and the ride is considerably smoother. I have no complaints at all and would def purchase TD's again.