So I've been reading a few threads regarding people's opinions of the various Epson scanners, particularly the 4990 and V700/V750. From what I gather, most consider those scanners to be good enough for 3-4x enlargements from 4x5 film, or basically a decent 16x20" print.

Conversely, I'm able to make a great looking 40x50" print from a 6x7 neg scan through my Nikon 9000. Are the Epsons that much poorer in quality that big enlargements aren't able to be produced by them or are there bigger differences in expectations among photographers here?

I'm curious because I'm looking into getting the V700 for my 4x5 work and I'm looking at quality factors such as shadow/highlight detail, noise, color rendition, and default sharpness. 30" is the largest I plan on printing, although that wouldn't be too often, 11x14 would be the default size for most prints. In summary, are the people who have the V700/750 happy with their purchase?