I'd have bought one if it wasn't for that. I'm going to use a Bluetooth mechanical keyboard so I don't need the bottom part but I doubt replacing the battery is easy. Also had two dell laptops die on me within 3 years of ownership.
The surface keyboard isn't the same across all the surface range so I'm comparing to the ones intended for the surface pro tablet line ('surface pro type cover'). They've got a really flexible backplate that means keys in different areas respond differently and they all feel flimsy. If you look at the weight of the keyboard vs the 7285's keyboard you'll see why, 310 grams vs about 700. Your surface book being more of a laptop has a sturdier keyboard, do try one of the tablet ones in a store some time. As for refurb batteries, I agree it's a concern but it is at least replaceable on this model. Screws and clips, no glue. Yay for business oriented devices where longevity is considered.
Cold. Not 1080p XD
My concern is this is a refurb and with a poor battery already, this is going to be an unknown quantity, especially as "refurb" can mean almost anything. The Surface keyboard is actually brilliant, I've owned one, which surface are you talking about? I've owned surface book. I conceed keyboard does look good, I think I misread/ misinterpreted last night where they said it was rigid.
The battery life is a totally valid complaint so I didn't query it. The 7275 was also very poor in that department, I imagine it's the main reason the 7285 never ended up being sold to consumers unlike the 7275 which was also the XPS 12. My only complaints with your rundown are that the keyboard's one of the best you'll find in the tablet market (beating the flimsy surface keyboard) and that this isn't a cheap device at all.