Canon's Selphy Printer is a strange proposition, to be sure. Bringing relatively decent-quality printing on a small scale to a printer that's semi-mobile. Printing tiny images on pocketable photo-paper sheets, making the entire process as simple as tapping the print button on your smartphone. But is it worth the hassle? Does having a printer this size allow you to become a mobile printing hero for your family and friends, or does it amount to a bit of unnecessary bulk (assuming you've already got a bigger printer at home)?