I stopped using my laptop (workstation/desktop replacement grade pc laptop) when a cooling fan bearing went bad. It's still operational, but not reliable beyond light tasks and I lack the funds to replace the fan or buy a new machine.
So I've been using an android tablet as my primary computer for well over a year now. It's okay as a backup for general web surfing, chatting, etc.
But it leaves me unable to do any of my art, drawing, 3D rendering/animation, game programming, and all of the other stuff I used to do.