I have not used the V750 myself, but I will comment about a general feature of scanners. Generally what you pay for going up the scale is moderately better resolution, better software, greater dynamic range, better out of the box files and much greater speed. My scanner journey went from Minolta Scan Dual III to Scan Multi Pro to Imacon 646. The Scan Dual III did pretty well with 35mm, but only up to 2820dpi. The Scan Multi Pro went to 4800dpi and did really well in terms of resolution. Color was a bit difficult to get perfect, particularly with color negative. It was quite slow, especially with multi-pass scans. You needed the glass carrier to get edge to edge sharpness on medium format. Overall it is a great scanner and I highly recommend it if you can find one.
The Imacon is leaps and bounds faster, resolution is quite similar, though it has more bite to the detail (and no ICE). It does dramatically better with color negative, has great edge to edge sharpness without a glass carrier, has greater dynamic range and scans up to 4x5 in any type of carrier you want, you can custom order them.
Anyway, the general point is that the more you pay, the faster they go and the less work you have to do.