I have on 06 600 and love it. My only gripes are that mine is a 144" instead of a 155" and the front bumper. I'm also not a fan of the hood and plastics, but I think that's improved on the '07's if I remember right.
I'm about 260 totally geared and it gets up and goes just fine. For the kids, they need to be careful for the first season or so, as it handles nothing like a phazer at all. I have my 12 year old daughter riding mine periodically (she prefers my wife's '99 600) in a controlled space so that I can teach her to ride it. You will not be disappointed at all in the reliability and power of the motor. I actually prefer the adjustable steering because the 1 and 2 settings make it easier for my daughter when she's on it.
Haven't checked prices lately, but I think that's fair for the mileage looking through classifieds a few months ago.