For me, 3D is a bit gimmicky and of no use whatsoever. However if it's there, then the option should be available to use it (or not) as required. As regards paying extra for it, no thanks - I would consider that part of natural development as is the case with most of the GPS systems out there. I believe TomTom boasts a 3D display, but it's not something I'd use. But I can see the difficulty (in terms of revenue) if the improvements are purely software based .
DC