Caveat emptores: With a couple exceptions, Surface devices
cannot be repaired, nor have the battery replaced. Not even by Microsoft. iFixit's repair scores on all the devices, except the Pro X, range from 0/10 to 1/10. If you have a problem that would require repair, you need to instead get it replaced with a refurbished machine. This means you have to back up your machine and set it all up again on a new one. If you're out of warranty, you also need to pay hundreds of dollars for this: $250 for a Go, $450 for a Pro or Laptop, and $600 for the Book or older Pro 4. It's unavailable altogether for anything older. They trumpeted improved repairability for the Pro X (edit: and Laptop 3), but I can't find anything suggesting a similar effort for the Book.
I like my Surface Pro 4 a lot. I initially got it for the pen when I was a math Ph.D. student. It was great for taking notes and giving lectures. I don't do that anymore, but the Surface machines still appeal to me as potential upgrades. But it's tough for me to justify spending north of $1,500 on a laptop when I can only expect a few years of life from it.
So, please, other laptop makers, make some 3:2 laptops. Dell, good job with that new 16:10 XPS. Microsoft, at least make the damn batteries replaceable.