More than anything and I honestly think it's always overlooked when buying a bike, look at the buyer, quiz him over the phone, and u get a rough idea about how honest a chap he is, and how he's looked aftered the bike,
Not really much that would go wrong with one, the one I've got now I didn't even test ride (first time I've ever done that!) but the fella was that convincing, turned out an awesome bike, one of the best I've owned.