We purchased two for my wife and I for our rv, we love them, easy on the hand, styleless, and most of all the power of the stream is equivalent to the plug in's.
Not sure if it is helping my gums or not but it is easy to use and only takes a couple minutes - looks nice and doesn't take up much room on the counter of the sink.
It took me a couple of times to get the hang of turning it off when I needed to spit and a little larger than i imagined. Other than that I'm very satisfied does the job well. I would recommend to others.
Waterpik replaced a competitors product that would not hold a charge, after only 3 years. Waterpik has nearly as much force to the water, and has worked without a recharge for over a week. The water reservoir is smaller, and forces me to either move really fast over each tooth, or to refill and finish. Not a big problem. Smaller size fits better for me on my only average sized sink counter space. Very good product.