I'm still on a T420s. Other than the rather crap panel it is a great machine still. I have been holding out for a decent fanless machine. Something with the same sort of power as a 3rd or 4th gen i5/7, M.2 SSD, 1080p or better 14" IPS, etc.
They are getting very close. I work in very quiet environments and I hate fan noise. Also no moving parts!
Admittedly, I use a Thinkpad t430 and a MacBook Air myself, but if I didn't have more laptops than I knew what to do with, I'd be considering Thinkpenguin (though, I'm of the same mind as Linus Torvalds, http://www.cultofmac.com/162823/linux-creator-linus-torvalds... , so I'd be likely to get a refurb'd MacBook Air).
Edit: link to Thinkpenguin site: https://www.thinkpenguin.com/