I am going to pitch in here. I've been using the iPad pro as my main portable machine, adn I have a windows gaming machine both at work and at home. I use the iPad while out and about. And I love it. Ive not tried heavy production on the iPad pro yet, like video editing and heavy lightroom, but I really love the portability, the battery life and speed of the iPad pro.
I am at least thinking of going for a 256 ipad pro 10.5 as my main portable device.