The portable water flosser is a great idea but after numerous times of trying to use it, I was unsuccessful due to poor manual dexterity. It was impossible not to make a mess with having a separate button for On and Off. The product would be great if the on/off were 1 single button and there was controllable variable speed too..
No, I would not recommend this to a friend.
Response from waterpik.comBy Waterpik, Product Support, January 3, 2017
We value your feedback! Waterpik does offer other portable models with a single on-off button and variable pressure settings, such as the WP-450 Cordless Plus (https://www.waterpik.com/oral-health/products/dental-water-flosser/WP-450/) and the WP-560 Cordless Advanced (https://www.waterpik.com/oral-health/products/dental-water-flosser/WP-560/ ).