@BCWeston iPad
mini 2 is a
wonderful tablet that does the job it is asked for, solid OS, stable, A7 provides good CPU power for video processing, no lag, no macro blocks, no nothing. It's perfect except in shiny sunny days, means it lacks in deed at the maximum delivered brightness (from this point of view an iPhone6S would be superior)
@GMack is right in saying iPad Pro delivers higher brightness, but tablet's huge size really unbalances the RC strapped around your neck.
That's why, my advice for you is:
1. get an iPhone 5-6 (it will be small but powerfull)
2. get the HDMI module to equip the RC
3. choose some 720p goggles with HDMI input.
(I have purchased goggles, waiting their arrival, FPV immersion will give you a completely new experience).