The V3 runs Navcore Version 7, where the V2 run Version 6. The interface is a little slicker, as are the maps, and it has other features like custom cursors (have your own car on the screen, rather than the arrow etc). The biggest feature update is Map Share. I would not sell a V2 for a V3, but if you dont own one yet is worth getting V3 due to future map updates etc. Also, there is a really cheap V3 without bluetooth that can be had for around £130.