I just tried out a V300 (35mm version of the V500) and man was I disappointed. I ran a scan of a print and the quality was OK. I wouldn't call it anything to write home about but not bad either.
Then I scanned a BW neg. Not bad again but dust was quite an issue.
Then the bad... I scanned a color neg. Everything about it was bad. The color was off, there was once again lots of dust... oh well on that. But the picture lacked detail and the color was horrendous with a horrible blue cast to it (should have been a gray brick wall with white lettering). I tried a few different color settings 24 and 16 bit and high resolutions. Not good at all.
I don't think these are the negative scanners I'm after. I attached the color negative scan. This is the first negative I could find. Nothing good by any means (my freshman year college floor graphic on the wall). But man was I disappointed with the scan quality.