It's thinner and lighter than a MBA, the lightest and thinnest of the MacBook line. It's slightly more expensive, sure, you have me there.
It's slightly more expensive, has half the actual storage (and even less when you factor in the OS and all the bloatware that it will come installed with), has half the processor, and doesn't come with a keyboard (!!!). There's no real upside to it. It has 1 extra inch of screen on the Macbook Air and a higher PPI which is fine.
The TypeCover for the original surface's weigh 255 grams, which makes it just as heavy as the MacBook Air. Lol.