Surface Pro 3
I have had a Microsoft Surface Pro 3 on my desk for about 10 months, I used it here and there for things related to work, or to play a game of Civ. When I changed jobs, I no longer had a use for Windows and the Surface just sat at the back of my desk sad and lonely. I then started to think about how my iPad is okay, but many times when I am out I want to do something in Emacs but can't. So I installed Arch Linux (kernel issues prevented me from getting Fedora running quickly), and now I have a great, light mobile computer that I can do just about anything on.
Update: Now running Fedora 23 with kernel from shvr until everything makes it into the mainline.