I've been using the Pixma MG 2140 for several moths now. It's copy quality, printing speed and quality and scan quality are excellent. I use it for a home office, so it gets quite a lot of work, and has always done just what I asked of it.
The MP Navigator software, when operating under Mac OSX, crashes on opening, then reopens and works fine. When closing the program, it crashes again and wants to send an error report. This bug has persisted through several software versions (I had a previous Pixma, same scenario) and several upgrades of OSX. Nevertheless, the software make scanning a large stack of receipts of various sizes super simple, and it's easy to then integrate the scans into my accounting paperwork.