I can imagine them being useful in a datacenter, yeah. So far for my own use it's been nice for writing at my nearby coffee shop, because it takes up less space on the table than a full-sized laptop and the small screen seems to help avoid distractions (so far, haven't had it for that long, etc).

And I don't travel long distances that often, but it probably fits better on train or airplane tray tables than a bigger laptop would too. I'm always worried the person in front of me will recline a bit when my laptop's in just the wrong spot and it'll shatter my screen from the top, haha.