I have a stack of X220s and parts which should last me the rest of my career, or at least until someone makes another laptop with an actual keyboard and a non crippled CPU.

Main thing that worries me is the bios, but coreboot seems to work.

It's funny the one I bought new direct from Lenovo in 2011 is still fine, but I was able to upgrade doubling the core count and getting USB3 by assembling out of I7 parts.