I've tried SpaceFn on a standard 65% keyboard with one spacebar, and I'm not a big fan of the experience. I found it difficult to get the timing right between registering press vs hold.
However, on a board with two spacebars — like Keebio's Quefrency or Sinc, or an Alice/Arisu board — I love it. I use my right thumb for space most of the time, so it's just a regular space key, and my left space is set up in SpaceFn style. Fn-B is a repeatable space key if I need it on that side but I hardly do.
I'm also weird in that I like to have the same modifiers on both sides, especially on keebs split in two. On a 65% with one spacebar, I use the Caps Lock key for left Function, and the bottom key of the rightmost nav column is End on press and Function on hold.
Control on Caps Lock is what gives me Emacs pinky for whatever reason. I keep two Control on the corners.
However, on a board with two spacebars — like Keebio's Quefrency or Sinc, or an Alice/Arisu board — I love it. I use my right thumb for space most of the time, so it's just a regular space key, and my left space is set up in SpaceFn style. Fn-B is a repeatable space key if I need it on that side but I hardly do.
I'm also weird in that I like to have the same modifiers on both sides, especially on keebs split in two. On a 65% with one spacebar, I use the Caps Lock key for left Function, and the bottom key of the rightmost nav column is End on press and Function on hold.
Control on Caps Lock is what gives me Emacs pinky for whatever reason. I keep two Control on the corners.