Hello I have upgraded my expert in fact it came with the upgrades installed from the factory. I had the 6fattie fsr for two weeks prior to my Expert arriving and it was on the old software. Yes you can easily notice the difference in power profiles between the updated and non updated bikes on the new software the assist just drops off like when you hit the speed limit in the high gears. The old software seemed a bit smarter and intuitive I feel the new software will be easier on the drive train and the battery range has been extended. I do find myself changing between Trail and Turbo assist much more than I ever did before I think I will have to buy the remote so I don't have to keep taking my hands off of the grips.