I've got both Pro and Air.
I've had absolutely zero issues with the Air. From the initial set up to test flight, it was seamless. Upgraded Firmware, first connection, all easy. Every flight has been flawless.
I am always impressed with how quickly it starts and connects to the RC and, unlike my Pro, my phone doesn't lose the connection to the RC.
Strangely, I have had the occasional drop-out with the Pro where the phone has frozen. Never happened yet with the Air.
If I was to choose one, I'd take the Air, no question. I do not need the range or battery advantage that the Pro has and the occusync and screen on the RC are proving to not be missed at all.
The Pro is still great, no doubt, but I just prefer the Air now, it suits my needs better. I am seeing just as good footage from the camera, it flies very well and it is more portable, which I really like.
I'm only keeping the Pro now because I have a friend from overseas visiting in May and it'll be great if we both have a drone to fly while he is here.