Using an X31 since ... something around 2006, and I'm very happy with it, except for:
Therefor I'm looking forward to an X120e or Thinkpad Edge ... but not yet sure what to do.
Switched to a X201, which enables almost everything I missed on the old X31.
Currently [Arch Linux]. Kicked off: Ubuntu (overloaded), Debian (actuality), Gentoo (compile time). I like rolling-realease and KISS.