This was the first time I used such a device and am fairly happy with it. I do not have experience with any other brand to compare. However, I have a couple of observations and suggestions for the WP-30. First, I found the OFF button to be a bit redundant. It would be more convenient if once the pressure from the ON button is released, the water stops immediately. The nano second between taking the finger off the ON and getting to the OFF button causes water to drip unnecessarily.
Secondly, when I charge it about once a week as I am supposed to do, I have no way of knowing whether it is charged or not. A small light somewhere would help. If there is one, I have not found it yet. Other than the above two comments, I am quite pleased with the device.