I just got mine a few days ago. 2012 NTX. Heavy AF, but nimble in riding. It actually feels more confidence-inspiring.
Join the Stelvio Group on the Facebook great group. Doc Warner who admins the group is amazing, just like Pete Roper and Beetle. Most suggest the Shinko tires as cheap, durable, and awesome. Mine has the Mitas, which are pretty good and knobby.
I have a friggin small leak or drips from my left cylinder and need to figure out how to fix it.
One of the most important things is to sort out the fog lights. They can blow your ECU due to a faulty wiring issuue. replace the fod light to LED or rewire.