I've been using it as part of my Setapp subscription, and it's a love-hate relationship. On the one side I appreciate the posture hint and the app nudging me to take a break. But ever so often I am in deep focus and get really annoyed when the "long break starting in 1 minute" notification pops up. Most of the time I am in the middle of writing when the break starts, and I click it away fast to not loose my thoughts. A feature recognizing active writing to push the break a minute would be helpful I guess.

LookAway does pause if you're in the middle of typing or dictating when a break is due (during the last 10s). It's off by default and you can enable it in Settings → Smart Pause → Don't show breaks while I'm typing, dragging, or dictating.