I have a Nexus 7 and an Ipad Mini, the Nexus is Brighter and small enough to fit on my panel, the Ipad I use on a kneepad which unfortunately means I have to deal with more due overhead glazing
I am at the stage of deciding which way works best for me, they both function well with the software.
I've never had either overheat, but my cockpit is a tad draughty