Ok, Linux Mint with Cinnamon desktop on the Thinkpad x300, and it's mostly working well. The Thinkpad runs hot, makes it less ideal for lap use while watching TV, and the keyboard is SO SO clacky. Trying to decide if it's worth taking to the PC repair to see how much it is to replace the thermal paste and if that will keep it cooler. The keyboard is a little sticky from the "Windows Vista" and "Intel Centrino" stickers kinda sliding around. 🤣
The Ideapad I put #LinuxMint XFCE on. That was a bit of a trip because the power died during the first installation and oh man getting secure boot off to work around mok errors was ... a mess. It's nicely cooler, but awfully big (wtf is with having a number pad on a LAPTOP back then?!) And although almost everything is nicer with it, its battery isn't charging, so maybe there's a hardware problem there too.
All and all, they'd both make perfectly decent web browsing machines, which is mostly what I need.