Coming from Two Tribes' Twitter...
It's amazing how small and toy-like the old Wii U Gamepads - the ones with the slide pads - feel when you're used to the final controller. Our older development kits still use those controllers. The new ones come with, what we assume is, the final hardware. We are glad Nintendo listened and changed the design. The resulting controller is much better suited for long game sessions.
I wonder why Nintendo switched from Circle Pads to traditional sticks. I'm glad they did, but I'm trying to figure out what the tipping point was.