Got a T440s myself too (running Ubuntu/Xmonad).

It's mostly a great machine, my model has 14"-fullHD-mat / i7 / 12Gb RAM / 256Gb SSD / 512GbHDD.

The only real caveat I can think of is the clickpad (no physical mouse buttons). That was a bad, bad decision. This piece of hardware has 0% usability, and under linux you need to tweak xorg.conf in order to get sensible defaults. Next generations of T4xx got it right however, trackpads with physicals mouse buttons have made their glorious comeback. Luckily I was already used to external keyboard/mouse, so that doesn't hurt as much as it could have been.

Question for whoever inside Lenovo knows the real story: what was the rational behind that whole clickpad thing?