i got the 700 and quickly exchanged that for the 750.
the 700 had great problems with newton rings especially visible on 4x5.
also the bundled software of the 750 is a big upgrade compared to the 700 (no multiple scanning, very primitive dust removal).

overall a good scanner, the software silverscan is NOT optimized for multicore processors and somewhat buggy, and i was never able to install IT-8 target with EZ colour on Mac 8-core.