I've never had a Filco, but I remember it was significant in the early start of the keyboard hobby. Many mods had been tried on the Filco Majestouch first. The first custom key sets had been made for Filco's Majestouch layouts first, etc.

My daily driver at home for over a decade is a keyboard that I had built myself around community-designed replacement parts for the Filco Majestouch TKL. This included a controller to customise the firmware, and that was my first start in programming microcontrollers.