I have a main desktop and a SP3, which I use for travel. The machine is great, the only real compromise being the screen size, but then I'm travelling so I'm appreciative of the smaller screen size.
My only real complaint is that there's only one USB - which I use for a small wireless mouse, meaning I have to disconnect the mouse on the rare occasion that I need a different thing plugged in.
In tablet mode, I find it quite difficult to control Windows (still not used it in earnest since W10 installed). The problem is that many of the control buttons are small and at the edge of the screen, where touching doesn't seem to be all that accurate.