I still use it on my primary desktop computer at home. It's a great, stable system that just keeps on running and doing what it needs to do.

I still use it on the computer room of our physics department (around 30 PCs). Slackware is the only distro stable enough to perform excellent on this heterogenous machines mix where some computers could be ten years old. I use a golden image, created and set up with packer and some scripts, and image it using clonezilla.

Surely debian would be fine on it, i even run fedora on a few 10 to 12 year old machines (heck ten years ago you already had Intel core chips)