Far more effective than any other distraction-blocker I've used, beautiful simple UI, and it felt like dev was reading my mind when it came to features I wanted and in navigating the settings. I also really love that when the timer runs out, it doesn't wipe-out whatever unsubmitted stuff I have on that page at the time, just clicking to extend the timer will return me to exactly where I was. Absolutely top-tier extension all-round. My only request would be a dark-mode.