2 years ago I got a 2013 model Macbook Air with 512GB SSD / 8GB RAM for app development. Turns out I now use it as my daily driver and I had preordered the original Surface Book. Being a Windows user something made me switch (first Mac with an SSD and an ultrawide monitor).

I basically leave it docked all the time. I really want to upgrade because I need more RAM and for video editing. But to give you an idea, I'm using it perfectly fine with XCode running docker containers with Mongo/Neo4j etc. Email, web and office stuff is no issue at all.

I paid about £940 ($1200) in Jan 2016. After all this time, I can sell it for £300 (30% of it's original value).