I installed Puppy Linux, specifically Bionicpup32 8.0, to an Acer Aspire One ZG5 from 2008 (the one that you had to take entirely apart to change the hard drive; I pressed on after making a post complaining about it). I'm impressed and pleased with how well it runs on an old laptop with 1 GB of RAM and an Intel Atom processor.
Internet speed is slow which is to expected on a laptop that old, though it's tolerable. The Wifi card is upgradable and that may be a project for another day. Visiting any remotely modern website causes the CPU to run at 99%, however I found a workaround - installing Chromium and then using an updated version of User-Agent Switcher for Chrome to force websites to load the mobile version dramatically reduces CPU usage on most sites*, down to around 15%. The CPU will still spike to 99% when a page is initially loading though. Youtube uses the entire CPU regardless, even with videos set to glorious 360p and I'm going to see if using an external app to play them makes a difference.
Outside of the internet I find everything to be pretty snappy and mostly intuitive. I need to use an external mouse because the touchpad isn't enabled and it seems like it's possible to activate it but maybe not? I don't know.
Is this going to be a daily driver? No, but it's something fun to mess around with and it makes me more convinced of the viability of using Linux on older (but hopefully more powerful than this one) devices to breathe new life into them. I may also try putting FreeDOS on it and turning it into a little DOS gaming machine, or ReactOS and playing some Windows XP games on it, which should work, since that's the OS it originally came with!
*I tested like four websites including Facebook, Amazon, and Discord. YMMV