I have few old thinkpads X220, X230, etc - outside of raw power, the two things that really suck are the speakers (they're truly trash), and the standard screen's performance with anything but trivial light around it.

Still, it's fast enough to use with linux, and the keyboard is a joy to use. Swappable batteries are fun, and useful.

However, I can't really use one outside of just nostalgia, or for tuning cars.