Same here, first apple product. Disappointed that it cannot handle 4k of my Phantom 3, so it becomes "just for the Spark".I'm not an Apple user but I did purchase a mini 4 just for the Spark.
I bought the 4 because it's newer.
So far so good.
It does fit very snug in the controller but it felt awkward to hold in my hands all the time so that's why I went with a Dirty J. Designs tablet holder.
It cost $35 and has a place for a neck strap to attach to which is a plus to have.
More time concentrating on your flight without having to worry about dropping your controller.