Well, I'm a long term Apple user and by and large I've been happy with my apple laptops and iPads etc, and I picked up an iPad pro not long after launch and absolutely loved it. So much in fact that with a logitech keyboard case, I have been doing probably 90% of my computing on it.
And there's the bomb. 90%, not 100%. I still had to get the laptop out for some things that iOS wouldn't do. A desktop class processor and screen and keyboard but not a desktop OS and it's bugged me since I thought of it. The microsoft surface has interested me for the exact same reason. As much as I dislike windows, a proper desktop OS in a tablet, with proper connectivity seemed to tick all the boxes.
So, today I bit the bullet and picked up a Surface pro 4 with a view to it replacing my iPad pro AND my Macbook. I have no idea if it will succeed but I had to give it a go.
This is unless Apple release a touch screen MacBook, but I think that may be a way off...