This is my second zenyum bought to replace the first one I have been using for 1 year plus since Nov 2020. Overall the design is great, lightweight, ergonomic, user-friendly, and long-lasting battery even after being used for 1 year plus. My 1st zenyum started to show wear and tear, metal cap both at the bottom end and top part loosening, but it does not impact the quality of brushing thou. Great product, my partner also uses the zenyum toothbrush,