The LA Times moto blog has a review up of the Vespa GTS 300. Here's a quote:
""Fast" isn’t the first adjective I’d use for a Vespa. Classic? Of course. Adorable? Truly. But with its new GTS 300 Super, Vespa has come up with a bike that doubles as a can of whoop ass. "
After riding the machine myself, I'd have to agree! It is a torquey beast! You can read more about the GTS 300 review, here.