Got my silver 128gb 9.7 pro this afternoon. Restored my old iPad Air backup onto it, updated to 9.3.1 and have been playing with it a bit since then.
First impressions: crazy fast and smooth. TrueTone is awesome. I'm not sure what the point of NightShift is with this - why would you need both? Also, I'm shocked by how much thinner it is compared to the already thin Air1.
I haven't yet got a pencil or keyboard, but I probably will over time.
I took a few photos to test the cameras (my current best iOS camera is the iPhone 6). The photos came out nice enough (nothing amazing though). I was a bit shocked to realise that they were live-photos. One came out quite cool.
One of the main things for me was rectifying my mistake with only getting a 16gb iPad Air, so I've been merrily downloading new apps.
Overall pretty happy