I will be getting my bike this month, also changing from an 848.
I had mine upto 8000 rpm and it shakes and vibrates a lot. It's not miss firing so I guess that is how the engine runs. I felt no impact on the handling, except it seemed to even more stable in the bends at those revs.I just want to share some thougts about our bike here. Got mine a month ago, a standard 939 in red😊. I just did a trip with some friends into the French Alps, and I think now I have the supersport with the highest kms on the clock! Prove me wrong😉😇 Done now 4700 km and the bike has seen a lot of mountain roads, highways etc. Coming from a 848 corse se, last model and before that a 996 for about 82000 km, , I must say this is a very comfortable bike!! Brakes are smouth, not agressive, engine is torqui and handling is superb! There are two things I dont like, throtle respons in very low revs, for example in town and I find at higher revs (7000/8000) on the highway the engine trembles. In each case more tan my 848/996. What do you guys think about that?