"But that's still less than a Surface or iPad Pro."
I think someone needs a new calculator.
Cheapest Surface 3 is $499 for the 64GB version. Keyboard is $129.
Pixel C is $599 for the 64GB version and keyboard is $149. Even if you go for the cheaper device with less storage, that is still $20 more expensive.
That and the fact that you can do more with the Surface because it can run normal Windows software as well as the new Universal apps and, if you want to spend an extra $49, you can get the pen as well.
As far as I can tell, the only area where the Pixel C really beats the Surface tablet is on screen resolution. It is actually a slightly smaller screen (10.2" vs 10.8") but has a higher ppi.