I've been using SkyDemon on the iPad for over a year without any problems.
The signal coverage is good and it's a very stable program.
About 6 months ago I became a Beta Tester and some of the features that have been incorporated in that time as well as what are planned, in my opinion, make SkyDemon unrivalled!
As for the overheating, i've never had that problem and i've done a fair amount of flying in various countries in hot weather.
Having said all that, as you're still a student and to avoid getting in to the bad habit of ignoring your chart and following the 'magenta line', I would install SkyDemon Light on your iPad and if you want to use it on a PC/Laptop, go to:
SkyDemon Light
If I remember rightly, with SkyDemon Light, you can plan your flights with it etc, but you can't use it as a GPS.
Give it a go, you won't regret it :-)