I use the Fujitsu ScanSnap S510M to scan checks before I deposit them at the bank. Later, when I’ve downloaded my transactions into Quicken and want to identify where the money came from, I can pull up the PDF and review all the checks. While the ScanSnap works quite well when scanning documents of the same size, it occasionally stumbles when presented with documents of different sizes. Sure, the size of personal checks are pretty standard, but if someone pays you their online banking account, those checks come in assorted sizes depending on the financial institution. After some testing, I found that sorting the checks by size and scanning from largest to smallest works the best.