Speaking as someone using 11 on an iPad Pro 12.5", I would take this (and will be taking this) over my Surface Pro 3. The screen is amazing, the new multitasking features are great, the battery life even on the beta destroys the Surface, I could keep going on but really this is a very laptop replacing device, for me. As usual YMMV, but seriously this can cover probably 90% of what I use my laptop for in a mobile setting.

Addressing my itch of curiousness: Why carry 2 phones?