I have been using this for about 2.5 weeks. It's convenient if you take it in the shower but quite bulky. It's messy if you use it over the sink. The compartment that holds the water doesn't seem quite big enough, but if it were bigger the waterpik would be even bulkier.
No, I would not recommend this to a friend.
Response from waterpik.comBy Waterpik, Product Support, December 27, 2018
We are sorry that you have found the unit difficult to use. This specific cordless model is not completely waterproof and we do not recommend using it in the shower. For tips on how to prevent a mess, you can view our helpful how-to video here: https://www.youtube.com/watch?v=Ia46JK-TvpE