I just got back my SPS revolved forks and shocks for my Super Duke. (the rear shock IS NOT as easy as it looks to remove!) Definitely a worthwhile improvement. Far less harsh, no dive although it didn't dive much before, and it still performs at speed. If you have this bike I recommend this mod.
BTW, GP suspensions did my front forks with their extension cartridge kit for my R9T and a Penske rear shock that was supposed to be comfort tuned. Super Plush revalving is much better IMO and far less money.