I have bought 2 used ones, and have been very satisfied.
Also saved around 1000 to 1500 over new. One had 2900 miles the other 400.
I was patient though, it took me 13 months before I got my first one. I would have had one sooner, but by the time I found one, it was sold. I even pulled in to one guys pace and the guy bought it about 15 minutes before I got there. They did let me test ride it though.
bought a 2006 with 950 kms in very good condition for 3250.00 canadian. seem high to what they are going for in the states but they are 5500.00 with tax for new up here, also they are a lot harder to find here.
i checked battery age witch was new
checked where service was done and how often
does everything look proper, ie tire condtion,odometer,overall bike condition, oil condition,how does it run and drive
check lights ,horn ,carb for leaks when bike is not running clutch,brakes throttle, air filter
if you are not familair with bikes try to find someone who is or get a shop to look at it
if you can pick up a late model low milage bike for thousnds less than new go for it.