So, I've bought this machine. Hardware is absolutely stunning, tablet part light and sturdy. It's slightly bigger than SP but 13 inch screen with 3k*2k resolution is noticeably bigger too. Keyboard has aluminium palm-rest and feels a lot more sturdy that SP4 keyboard. I like it better. Pen has rubberish tip, which give it some grip but slides easier than SP4 pen. Initial activation force is noticeably smaller than on SP4 pen and pressure curve feels more natural in general. I'll make a clean windows install and post some more detail if you guys are interested. Do you have any questions?