On this 2010 Vespa 300 GTS Sport I only have 12,000 km.. I only bought it this spring and didn't do any long rides. So far no problems.. on problem with a coolant hose, but I broke it my self.
On my silver scooter 2009 250 GTS I have 18,000 km (as far as I remember) and I had one problem.. but its a big one.. my engine ceased... don't know why but its getting fixed under warranty.. taking a very long time!!! (it have been in the shop for more than a year now!.. good thing that I have a second scooter)