Not a bad bike but you will soon grow tired of it. Take a good look at all the components on the bike if anything will need replaced. Some Ducati parts are hard to find and when you do find them or they are available at the dealer you will have to wait for a long time.
The 620's differ a little bit than the larger brothers. I think that model may have non-adjustable suspension and have a wet clutch. Not a bad bike but I'd look for something a little bigger.
Also, if you plan on keeping her for a while you must think about maintenance. Valve adjustments and belt replacement every 12,000 miles. For a 2 valver it will cost you a few hundred bucks at the dealer.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R