I have a 4870 and I am very unhappy with it. The software is a shame and gave me a crash so severe I had to reformat. It refuses to recognise my whole ram (4GB). Besides, this kind of scanner neither focus nor keep the film flat and the results are very poor. I read an extremely negative review on the V700, so I will stay clear of it.
The real point is how much the various brands mind demand for better scanner. Minolta is no more, there are a lot of complains on Nikons that are not addressed by them with new models. I suspect they want us to give up film and our old photos as well, and buy a plastic digital gadget instead.
By the way, I have problems with printers too and no clear upgrade path. The 4800 cost in Europe 2 times as in the States. I am really stuck
Regards
pistach