Overall customers find the electric toothbrush handles (iO series) and compatible small round brush heads deliver strong plaque removal with gentle gum care and long battery life; notable positives include pressure sensors, multiple modes, quiet operation and ergonomic handles with travel cases and fun designs. However, a minority report durability issues—charging failures, mould retention and short head lifespan—and some incompatibility with alternate brush heads. Several customers experienced delivery, packaging, missing items, return/refund and regional adapter problems, though there are also reports of excellent customer service.