I've been using an iPad mini for a year now, as do a number at our club. I use the RunwayHD software from Airbox, as it uses the same 1/2 mil and 1/4 mil maps that we're used to, it includes the Aware style airspace warnings and it is simplicity itself to use. Very similar to SkyDemon, I just prefer the maps and airspace warning feature (has been very useful when navigating around busy London airspace). Others in the club also use AirNav Pro on their iPads and a few of us have Runway HD. I only ever fly VFR, no idea what you would need for IFR.
I prefer the iPad mini for size - I strap it to my knee - and I've never had a GPS drop out. Also never had a problem with battery life or sun glare. My iPad is the 3g version, so it's GPS receiver is built in, although I don't use a sim card.
I bought it primarily for flying, but now use it for loads of other things. Great for reading or watching tv/films on as well, especially when waiting at an airport! I love it!
