I've had 3 Buells, including an XB9S & XB9SX. I put 40k on a first year (2003) XB9S and only ever needed gas, oil, spark plugs, and tires. I won't be nearly as fast in a straight line as your GSXR. Speed is closer to an SV650. XBs are reliable and simple to maintain. Dealer support sucks, but that was true even when Buell was still around. If you can read a manual and turn a wrench there is little reason to need a dealer. Maintenance is simple DIY. The best qualities of the XB9SX are the comfort and the handling. Handling will feel a lot different than the GSXR, but once you get used to it they eat up tight twisty backroads. btw, VERY few parts are interchangeable with Harleys. Maybe the clutch ramp and some gaskets...not much else.