So, let's start this off by saying one this -- Yes! The DS-640 is a great scanner... HOWEVER.. It does have some issues that bring it down a peg or two.. I'll start this off by highlighting the positives -- It's portable. It's easy to use. It's lightweight. On the downside -- It's infuriating after scanning only a few documents that you're told "OH NO! We're out of memory!" .. The first time it happened I stared at the message on-screen and thought to myself.. How the heck can it be out of memory when I have 64 GB of high-speed RAM in the computer... Then I remembered that the chips inside these scanners have temporary memory built-in... but then the kicker... ...buuut I only scanned TWO PAGES... They were 3 color (black, blue, red) documents and standard paper size. It's not like it was a full-size poster in crisp detail at maximum resolution, bitrate, with edits... This was a major failure of the design, and was actually my first experience with the scanner, which as I don't need to mention, is NOT GOOD! A terrible look for the BRAND, as this was my first ownership of their brand's product, and not good for the future of this little new device sitting on my desk with the threat of return, due to a degraded trust in the product. If it's going to fail me on day one, what's it going to do on day 365? That brings me on to my next quarrel with this device. Resolution and color limitations by size. If I want to scan a sheet of paper at the fullest-size available for this device in the MAXIMUM allowed quality (resolution and color and bitrate), why am I limited from doing so by software? We physically know the scanner can do it, because we can do it with other smaller sheets and the compliance with the HARDWARE is there... but for some reason, I get rejected by software when I want to actually use the product to its fullest potential, hardware wise. With auto document sizing set to "On" you can only scan stuff at a resolution of 300x300 dpi, regardless of being set to black and white or full 24-bit color. The device does have a slider to control a guide for paper size, but it's so flimsy and loose in the track that even if a document does start to kink to one side, it's pushing that guide out of the way. No sense in even having it there, really. The port on this scanner is not a generic connection, and requires a dedicated special cable to hookup to your PC by USB, so don't expect to be able to head down to your local PC repair shop and snag a new cable after your pet gerbil decided that the big thick black cable looked like a delicious after-dinner licorice dessert. With all this in mind, choose carefully. If you're using this to scan documents in an office setting, it's fine, I guess. Just be ready to scan that 43-page packet 5 times over until the software quits telling you that it magically ran out of memory. If you're using this to scan photos, whip out the old handy-dandy ruler and be ready to fight with size-presets telling you that you can't use the fullest scan quality on auto-sizing. As the package says -- Be sure to save your box and packing materials, in case you do ever need to send the unit back in for service or repairs. I recommend buying a wet/dry scanner cleaning kit.