I jumped to the 650 for my 2nd bike. I came off a 750 cruiser (but with only 36HP) that i rode for just over 2 seasons. I must say I couldn't be happier with the 650. I love the overall feel of the bike, the performance and of course the styling (now i don't want to start a war with the G2 owners, but the G3 owns!!! LOL
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THe 650 has power in almost every RPM range and in any gear. IT's nimble, the seating position is perfect (i'm about 5'9, 185 lbs). Overall its an amazing bike...
I did a full day of 2-up with my faince... no issues whatsoever... bike had the power everytime i asked for it.
Overall, not much to complain about...
THe only downside that I see is that it has the Bandit Buzz (ie, some vibrations)... I came off a fairly smooth cruiser, so it's just a matter of getting used to it.. there are remedies for it (like barsnake, heavy bar,ends, carb synch, etc) but i haven't tried those yet.... I DID tighten all the bolts and after installing engine guards, the footpeg vibrations got less noticable...
All in all, an awsome bike... you won't be disappointed...
Additionally, if you but a 2007 model, you'll have fuel injection and water cooling