A Ducati requires a fine line of maintenance, clutch adjustment is critical, replacement parts are very expensive and you need a cool head to work on one.
I would suggest if you do buy it is take it to a Ducati Dealer and have them do the required maintenance by the book, working on that type of bike yourself requires high skill with experience.
Don't get me wrong, its a great bike, but its no gas and go bike, it needs a lot of attention.
I would suggest the Japanese clone of the Ducati, the Suzuki SV650S as a much better alternative
