You can't really fault the iPad and the iPad + Skydemon combo is THE ONLY combo as far as I am concerned. It is brilliant. Never had a problem - using New Ipad with internal GPS and it seems very accurate and never loses GPS signal and never known one to overheat.
However I would prefer to use an Android Tablet, and my Motorola is superior to the iPad technically, plus you can slot in a 64GB memory card available for £20. However Skydemon is not available for Android (yet) so it is not an option as far as I am concerned. I believe the Skydemon team are working on this though, so rather than buy an iPad (I nick the Mrs's at the moment
) for myself I think I'll just wait a while.