The scan quality in itself is very good, quite a bit more expensive with my Canon flatbed scanner comparable. The great difficulty is to pull the scanner just over the document: in short text snippets not a problem, but if you want to scan whole A4 pages, it gets tedious. Because the immediate control is not possible, so I scan the same side for safety's sake always a couple of times. With practice, the success rate is better, with tricks, you can help out, such as by fixing the sheet with adhesive on the table and then the scanner performs ambidextrous.
Conclusion: not a full replacement for the flatbed or sheet-fed scanner, but an acceptable temporary solution that is much more compact.
