I think that more than the shaft transmission, the power has more weight in satisfaction. I'm not referring to extreme power, but to decide to change for something that has less power, to do the same things you have been doing, the first thing you will notice is the power instead of the transmission. Chain drives have improved a lot in the last 10 years, as has power. Today with less cm3 of displacement (and less weight), you have the same power (or more) than 10 years ago (only at a higher rpm)...but having the same power (or more), and less weight, makes Your satisfaction will increase by doing the same things….With extreme power (1290 or V4), satisfaction will come from the side of Adrenaline, if that is what you are looking for (generate more adrenaline), a 1290 is the way…. Reliability indices are also a probability and are related to the good or bad use you give to the motorcycle (a Gs Adv is not oriented towards enduro, but if you practice it there is a greater chance that something will break)… and that is what many do with it…