There aren't any problems as such with the mini but the iPhone 5 is so much more convenient. You look at all the fiddly stuff on Skydemon and think 'well I might want to change route midway and see what the fuel price is in Iceland' but truth be told, 99% of the time you just need the purple string to glance at now and again. I'm not knocking the functionality of SD, it's an amazing bit of kit but having had the mini stuck in front of me and the iPhone I know which I prefer. But each to their own preference.