Bigger screen is always an advantage in SI...

The HB units carry a 1 year warranty... So the used unit may be out of warranty...

I don't think there are any hardware changes for 2012....any changes will be software that any unit can be upgraded to...

If you buy used... Be sure and call HB to register the unit under your name so that any software upgrades available will be in your HB account when they become available...

Rickie