I picked up one of the original Acer C720's back in 2013. Anemic 2c1t (dual core) Celeron at 1.2 Ghz and 2GB of memory. But Gentoo on it with XFCE was incredibly nippy. Add a processor optimized Firefox at the time and it was an extremely good tiny laptop
A year or so later I upgraded to its "big brother" the core i3 variant (2c2t, quad core) with 4GB of RAM. Same experience. Extremely happy with both machines
Eventually as the Chrome browser started to eclipse things though I moved to Dell's Chromebook 13 "Lulu" with a beastly Broadwell i5 quad core and 8GB (soldered) RAM
The biggest draw for me is these were the first Linux machines I'd used where everything didn't "just work" or "it works okay but you can tweak XYZ" it worked in the sense it was explicitly designed __to run Linux__
For all the flak Google deservedly gets, the decision to enforce a "no binary blobs, everything must be upstreamed to mainline Linux" kernel and Coreboot (BIOS) as well as making "jailbreaking" the thing with a permanent firmware flash as simple as removing a hardware screw was commendable
These days I'm stuck using an MSI Modern 14, which while "okay" is nowhere near as delightful as the Chromebooks were previously