I've got an older brother, the T440s, also running Arch Linux. It's pretty good. The keyboard had to be replaced because a few keys broke off after 2 years; it got replaced on-site for free though. The feel is good but apparently and disappointingly, the keys are attached with tiny plastic teeth that aren't too sturdy. The screen is IPS but a different SKU and lesser quality than the panel the first reviewers seem to have gotten.

Apart from that, it's silent, usable and reliable, and still not too hard to replace some of its components. I'd consider getting other one from the T4xxs line if it broke.

I've got a T41 (I think) from the IBM time lying around. That thing is built like a tank; I wouldn't step on my T440s, but I'm reasonably convinced that old machine could take that sort of abuse. Great keyboard, but atrocious screen (like most old Thinkpads).