While we're on about old laptops, my laptop is a ThinkPad T540p which I bought used a few years ago.
Still working fine, and I've recently set it up as the my WfH work machine (work is too stingy to supply anything) and bought the UltraDock for £10 from eBay.
I've done lots of upgrades though.
Upgraded the screen to 1080P IPS (a nightmare of a project as bezel, cable, hinges and top lid had to be replaced), 16GB, and replaced the touchpad for the hardware button hack as otherwise the TrackPoint of unusable.
About the only thingi haven't upgraded is the CPU. Haswell was the last CPU generation where laptop chips were socketed, so I could swap my i5 dual core for an actual quad core.