Until it gets in sunlight. Don't get me wrong I've been using an iPad for years with all my DJI crap, but I just moved up to CS.
I have never been a Apple fan, and I was also convinced that the iPads were inferior (to the Crystal Sky) under direct sunlight, until I actually viewed the iPad pro screen under direct, full, midday sunlight for myself. The iPad pro screen is very different from, uh, "non-pro" apple tablets, and you'll find it to be every bit as clear in direct sunlight as a printed page. These things are seriously the best view under bright, midday sun, that I have ever seen, better even than e-ink, since the iPad offers full color with no discernable pixel lag, and unbelievable contrast.
I was headed for an iPad mini, since these fit the controller, but I didn't like its full-sunlight performance, so the Crystal Sky was heading for my shopping list, but when I saw this youTube video, my opinion quickly changed:
The video host compares various phones, tablets, and Crystal Sky under full sunlight, the only two comparable images being produce by the Crystal Sky, and the iPad Pro. That is until the host reveals that the test wasn't displaying the iPad Pro's full brightness.
At 1:09 in the video, he admits this, the turns up the brightness in the iPad, and it blew away the Crystal Sky, IMHO, hands down.
That video made my decision for me; the Crystal Sky was out, the iPad was in, and the one I hold in my hands is unbelievably clear and bright, even in full, direct sunlight.
Selecting sunlight readable screens is one of my top priorities professionally, since I need industrial touch panel screens to be highly visible in outdoor or driller's cabin installations for energy, oil and gas equipment. Some of these panels cost upwards of $15000.00, and their sunlight visibility is excellent, but the iPad Pro display blows these away, once again being the best I have seen EVER, and I only hope industrial panel PC and monitor manufacturers can employ similar technologies soon!
Anyway, I would hate to contribute to any "buyer's remorse" you may feel when you discover this fact to be true, but regardless, the Crystal Sky is a solid, good choice, with super-excellent sunlight readability. It's just not as good as the IPP, and I wanted a "display" that could perform other functions when my DJI drones were at rest in their cases.