The Oral-B iO2 Electric Toothbrush receives overwhelmingly positive feedback for its quiet yet effective cleaning, with users noting visibly cleaner and smoother teeth. Its three gentle brushing modes, pressure sensor, and 2-minute timer with quadrant alerts are frequently praised for enhancing brushing technique and comfort, especially for those with sensitive gums. The ergonomic design, long battery life, and included travel case add to its convenience. A few users mention a slight learning curve for new electric toothbrush users and a preference for clearer mode indicators, but these are minor points in an otherwise highly satisfying experience.