I used to have an R1100GS. I now have a Sport City 250. It has the same motor as the Vespa but bigger wheels. Except for leaking fork seals I have had zero problems in 14,000+ miles. Not a good comparison but I had numerous problems in the 87,000 I put on the GS. I do ride my Aprilia on dirt roads. It is much lighter than the GS but has less suspension and I'd hesitate to do water crossings on a scooter because water in the CVT may cause the belt to slip.
I ride, Therefore I Am.