Re: re: Folding tablet
X220 was the last known good X series Thinkpad. Still very decent keyboard, built like a tank, fully repairable and upgradeable, i7. Bought it refurbished for $160, spent another $150-160 on upgrades (added SSD, upgraded HDD, added RAM), and voila - best machine for my purposes for under $500. Use it extensively for five years already and expect to use it at least another 10.
Multiply it by 2, as I got two of them - for my wife and for myself.
X230 and after - don't even bother. Keyboard (famous Thinkpad keyboard!) devolved to total crap, to begin with. Also unreliable. Bought new X230 for my wife, and she had a year of pain running to the repair shop now and then, until I ran into those refurbished X220s.