If you mean the quickshifter / slipper clutch system , I have it on my 2017 MT-09 and I personally feel it is just a gimmick, but others may feel it is beneficial.
Not so much the quickshifter more the slipper clutch. I had a quick look on Fowler’s Yamaha and it looks like it would be cheeper to buy an aftermarket slipper clutch than buy the parts needed