[norwayjose]

Aeron chair - I bought this in 1999 and it's been much more comfortable than any chair I've used at any office I've ever worked in.

4k monitor - Picked this up on a Black Friday sale 1.5 years ago. It's much easier on my eyes than the HD monitor my company provides in the office.

KVM - Allows me to switch between my work laptop and some of the higher end embedded machines I work with. I end up needing to swap cables at work.

[wannabebarista]

I didn't even think about the KVM switch. That can be a huge time saver!