I love my Epson V500 that I use for all my stamp scanning. It provides greater surface detail than any of the (many) others I've tried over the years. That said, it falls down in two areas:
1. Oversized document scanning. An 8.5x11 bed isn't really large enough, especially when dealing with stocks, bonds, deeds, indentures, etc. I keep looking for a decent scanner though, as a digital camera is problematic with respect to lighting as well as dealing with documents that have been folded, curled, or otherwise will not lay completely flat.
2. Scanning a large number of sheets, i.e., scanning pages from a book or magazine. Using a traditional flatbed scanner for scanning a large number of pages, especially 2-sided pages, is a very slow, laborious process.
With respect to #1, I have tried any number of affordable 11x17 (tabloid/A3) scanners, e.g., Mustek, Plustek, as well as the 11x17 scanning bed on the Brother all-in-one 6720DW (now sitting unused in storage), and they are all craptacular. Very poor image quality.
So-called "professional" large format and duplexing document scanners are NOT cheap. About the only way a consumer can afford one is to buy on the used market. Normally I do not recommend buying older consumer-level scanners used, as they tend to be slow, CCD rather than LED, SCSI-only or USB1 communications, and frequently are incompatible with newer versions of Windows. However, professional scanners can be a different animal and usually have greater longevity as far as driver support, and are built more robustly to handle a heavier duty cycle.
After doing a fair amount of research and seeing what models are readily available on
ebay, I settled on the Fujitsu 5750c. I took delivery of one yesterday and spent all evening putting it through its paces.



This model was sold from 2004-2007 and had a list price of $8,995. You can find them on
ebay now for $350-600, depending on condition, whether they have all the trays, etc. It's incredibly heavy at approximately 80 pounds in weight.
This sounds like an ancient device, but it really isn't, at least with respect to feature set:
* Supports both Ultra-SCSI and USB 2 communications.
* LED (so fast warmup)
* Fujitsu has current drivers for Windows 7, 8, and 8.1
* Supported by VueScan
It's an interesting animal in that it has both a 12"x18" scanning bed, as well as a positionable duplexing document scanner with 200-sheet input tray. Optical resolution is 600dpi, which is low by today's standrds, but for document scanning and oversized items, is more than sufficient.
It will scan 2-sided documents at 50+ pages per minute from the document feeder.
Just some comments from working with it last night in no particular order:
* The preview when scanning from the bed is VERY fast. Quicker than I was expecting.
* Image quality, while not as good as my Epson, is far and away better than any of the other A3 scanners I tried.
* Using the TWAIN drivers to scan into Photoshop, and also using VueScan, resulted in a maximum image size on the flatbed of 11.7x17 inches, smaller than the max image size given in the specs. Using Fujitsu's Scandall Pro (free version) downloaded software, however, gave me a full 12"x18" image.
* Document scanning was hit or miss initially. Scanning directly into Adobe Acrobat Pro XI did not work well at all. The page size autodetection did not work at all, and even setting it to a discrete image size resulted in an offset in both X and Y directions that pushed the image off the page area. I was never able to resolve this. Using VueScan, however, the document scanning worked like a charm.
I did a LOT of trial and error last night (well more like error and error), but even with the learning curve I managed to get 2 complete issues of The American Revenuer from the 1970s scanned to searchable PDFs. 600dpi bitmap (monochrome) makes for very nice image quality, very accurate OCR, and relatively small filesize (each PDF is under 2MB for a 16-page issue).
The particular unit I bought showed a counter of just under 40,000 scans, which sounds like a lot... until you realize that the duty rating of this unit is 8,000 scans per DAY.
Overall I am very pleased.