Summary: I thought the unit was just "fair". It was difficult to get things to scan without being skewed one way or the other. I futsed with the software endlessly and just could not get a good scan of text. I ended up buying an all-in-1 printer that had a flat bed scanner on top.
Excerpt: I have Windows 7. Followed all the instructions and didn't work. Called support and followed them, didn't work. Deleted installation and redid installation following instructions. Didn't work. And every single time I contact support, they tell me to do the same thing I did, INSANITY, right?
Pros: Compact, Durable, Easy to Use, Great Picture Quality, Lightweight
Cons: Hangs Up All The Time, Have To Plug And Unplug, Pdf Doesn't Work Well, Support Says Same Thing
Summary: I used to own the M-12 Plus and loved it, but they are not making Win 8 drivers for that. So I bought the S400. I find it to be better quality than the M12 Plus, so it should provide years of flawless performance. The software package that comes with it is great for a traveller like me.