Faults:

Absolutely nothing, except a clutch cable, which took 20 minutes to replace.

General Comments:

This is an absolutely incredible bike. I would say one of the most understated bikes ever. Its handling is astounding, the most fun you'll have on two wheels. I've ridden sport bikes and tourers, and haven't enjoyed a bike as much as the Duke.

There is one thing though:

It's a single cylinder, so it vibrates; it's barely noticeable around town, but for longer trips it's terrible. I needed someone to massage my ass back to life.