I have two friends with the 12.9" Pro:
One guy loves it and uses it all the time at home, and even brings it with him to work. However, he states it's a table-top or laptop device for the most part, not handheld like the 9.7", and he also uses it to demo his work to clients. So for him, he's actually using it as a "Pro" device to an extent.
The other guy thinks the 12.9" Pro is totally useless. He uses his iPads purely as consumption devices, and likes to have the portability and handholdability of his consumption devices, and unfortunately, the 12.9" just doesn't suit that.
So two very different perspectives, from two very big Apple fans. BTW, I fall in the latter group. The 9.7" is as big as I'd go. If I want more "Pro" usage, I pull out my MacBook Pro.
I'm not surprised at 16 GB with the SE. I would be disappointed with the iPhone 7 though.