I just got some distressing news from DJI support - I have a Tripltek 8 tablet, super bright 1200 nits, massive 12,200 mah battery, has been working great for 6 months, all of a sudden Fly app says "RC not connected to aircraft", and it just disconnects and reconnects over and over (May 3). DJI says my android tablet is "not supported" and they "recommend for flight safety using a supported phone" (my iPhone still works ok, but can turn off when it gets too hot, and not nearly as big or bright as the tablet, so I guess that isn't really a "safety issue?). My tablet cost about $700, which seems like wasted $, if I can't get it working again. I think maybe there was an issue with the kernel update on the tablet, and not sure if I can figure out how to roll it back. It just bugs me, DJI seems to be trying to force me into buying their RC Pro controller.
None of these options are cheap except
Geniatech paper tablet, all I can suggest is to ask these questions before you buy something that might work fine, until it doesn't any more.