David:
I tried the free version on my iPhone, and it worked fine in the air. The iPhone isn't as user friendly as the iPad as far as looking at the sectional, etc., because the iPhone screen is so small. I went ahead and subscribed, but I don't use it a lot in the air. I have a portable Garmin that is a dedicated unit, and I much prefer it. Then again, I was tickled pink when I got my first airplane that had a LORAN installed, and the LORAN only had digital readout of the ETA, course and track, etc. -- no moving map. I am not one of those people that has to have the latest gadget. If what I have works for me, I had rather use my money for Avgas. I also carry paper sectionals because I like to be able to see the big picture better than I can on an electronic device. Foreflight is very handy, though, when going cross country to look up frequencies, etc. It shows radar weather and I have used it, but I can't remember whether or not it gets updated in flight.