The Oral-B iO2 Electric Toothbrush receives overwhelmingly positive feedback for its quiet yet effective cleaning performance, with users noting visibly cleaner and smoother teeth after use. The three gentle cleaning modes, gum pressure sensor, and 2-minute timer with 30-second interval alerts are frequently praised for enhancing brushing technique and comfort, especially for those with sensitive gums. Its sleek design, long battery life, and included travel case add to its appeal. A few users mention that replacement brush heads are not as easily accessible as expected, but overall, the product is seen as a reliable and user-friendly upgrade from manual brushing.