I'm not sure where you're located but you might want to find out where the unit came from because sometimes the mapping features are country or region specific. I can't advise you to buy anything used, that's totally up to you. Many times an older unit might have a battery that does not retain a charge as long as a new one might. If you do go the used route I would research all the functions the unit is supposed to have and make sure you can test it before buying.