@djlink @idbrii @sinbad fair. For my personal use I rarely use function keys, and when I do I hold a combo key with thumb/pinky and press the number keys. But indeed, that might not be enough if you use function keys a lot.
The lovely thing is how configurable it is. You can set it so that you have a toggle key that makes the number keys always function keys, until you toggle it off again; or so that holding down a number key triggers a function key; etc.