The Epson WorkForce ES-400 Color Duplex Document Scanner is a full featured and very capable personal and business document scanner and works well for everything from receipts to reports to books and periodicals. The Epson Document Capture software that comes with the scanner is full featured and actually rather powerful. It has options that can solve almost any scanning problem.
There is a bit of learning curve in both finding the right mix of options for your scanning problems and in understanding how the the various options interact with each other. Likewise the HELP available at each level does in fact exactly explain every feature and option. Likewise, the best setting for scanning text documents, especially books, is to use "page and content" skew correction. I obtained great results on books, even books with extensive full page images, using this setting. However, when a document has images a page will be aligned correctly as long as there is some text, even if it is only a caption. If the page has an image only then the software will sometimes zero in on angles in the image and twist the image way out of alignment. The best setting for a page with an image but no text is "paper skew" only. It would be helpful if Epson had anticipated this mix of page types and had built some IF/AND/THEN code into the software that would basically be "IF image and no text AND paper and content skew set THEN paper skew only" even if the software was set to "paper and content" skew correction.
Another example is page size. The Auto Detect feature works very well. But it can from time to time choke and cause a page less than full size to be rendered on a full size background. I have found the best course with book scanning, for example, is to manually set the dimension of the job. This however requires going down a level, selecting format, selecting "user defined" and then creating a profile for that selection. Then save that profile, go back to the main dialog, etc. However, if you should opt to change from single to double sided scanning, or the reverse, in the middle of a job then the page size will revert to LETTER. You have to go back down and manually reselect the User Defined profile again.
One other example is the image type settings for "Auto, Color, Gray and B&W". You might think that this is for the capture mode. But in reality it defines the output mode. The scanner captures in full spectrum in either case. This impacts the scanning of documents that have paper that is not exactly white, or books with yellowed pages for example. If you use the GRAY mode for these types of problem sources the results will have a muddy sort of "dirty" looking page tone. If you use B&W then every single little variation on the page will be rendered as black dots or smudges. The solution is to use the setting, once again, down a level, that allows for filtering input to not include various colors or to capture only black. Likewise, you could use GRAY mode for capture but boost the contrast of the captured image. Using any of those image correction options disables "text enhancement", a feature that contributes to text readability, so you may need to increase image resolution from 300 to 600 dpi when scanning docs with problematic paper color or yellowing.
In any case the power is there in the Epson software to get a good result, but the location, relationship and interaction of the options isn't exactly obvious. The scanner comes with a TWAIN driver that allows the use of other document management software. Either way the scanner hardware is excellent and the results that I have obtained with a broad range of document types, including scanning art books with full color images, have likewise been excellent. The scanner handles most paper types without a problem, although the sort of thick, almost card stock like glossy paper used for many art books printed in China can sometimes cause it to jam and require some page by page attention. For most routine jobs with new or recent documents in good condition however the scanner just sails along and the default settings will produce great results. This is a review for the Epson-400 Duplex Document Scanner that I have received free of charge to do a beta test and review.