All the comments about SilverFast are dated because the software released last month has been redeveloped from the bottom up and the GUI vastly improved. You won't need a PhD in rocket science to use it successfully. It will scan images as quickly as you scanner, resolution and multi-exposure settings allow. It's preview system is smart and rapid if used properly. The use of iSRD for dust and scratch removal requires one scan for capturing the infrared channel, and it's infinitely faster than any other means of removing crud, dust and scratches from transparent colour media without impairing image detail.
The Epson V750 will deliver very satisfactory image quality from reflective media and medium format transparent media. Depending on the stringency of your requirements, it will deliver adequate sharpness from 35mm media, but not as crisp as that from a Nikon 5000 dedicated film scanner which is no longer manufactured and can cost in the range of USD 2500-3000 on the resale market. The Epson V750+SilverFast 8 is a good choice for someone who wants the combination of decent image quality, productivity and all-round flexibility with batch scanning capability for both reflective and transparent media. Yes, you may well get crisper finer detail using a very well calibrated DSLR set-up, but I remind that you'll need to pay close attention to the lighting, alignment, lens distortions, with set-ups differing depending on the media; as well, depending on what scanner is being compared with what camera, native scanning resolution may well be higher than that from a DSLR. As usual, it's really not either/or. There are compromises in all of this, and any of these techniques and approaches can be suitable depending on the user's needs and objectives. Professional photographers with excellent digital cameras also use scanners. However as I said above, no harm testing a camera-based approach to see if that's for you before buying a scanner.