Four years ago, I was about to start my first teaching job and needed a small, cheap, portable MacBook to tote between school and home. I settled on a used 2011 11" Air (1.6GHz i5, 2GB RAM, 128GB SSD), which was a pretty solid deal for $400 in 2015. This little computer has seen me through nearly four years of teaching at this point, five major versions of OS X (I got it with Mavericks, it's running High Sierra now), and it continues to perform flawlessly. Perhaps not quite as quick as it used to feel, but certainly not slow for my needs. I initially got it as a machine to do basic Office productivity tasks on, although I have recently shifted a lot of programming and light CAD work onto it, all of which it handles without a hitch. It does indeed bog down when I have upwards of 7-8 apps running on it, or I go heavy on the Safari tabs, but with 4-5 tabs open, Word, TextWrangler, Terminal, and iTunes cranking out some tunes, it works beautifully. All in all, not bad for a laptop going into its 8th year. Speaking of, this machine has aged incredibly gracefully. Not only did it just recently lose official OS X support, but its battery is holding up very well! It's the original battery, and at eight years old and 420 cycles, it still holds 86% of its original capacity. It'll happily go for 4-5 hours of usage on its battery, plenty to get me through even the worst faculty meeting. How many of you out there still have your old, limited, but still surprisingly productive 2GB Airs in service?