So the unit works excellent. I gave it 4 stars because it is a little hard to handle. As far as operation goes, it is excellent. It you have room on your counter, I would go with the smaller hand unit and tank on the counter. This unit is a big (hand unit) because it also holds the water. Other than that it operates excellent.
This is one handy little item. I have the Waterpik Aquarius Water Flosser Professional that i use on a daily basis at home. This jewel, the WP-580 is great to have while traveling. It holds a charge for several days. This is a must while traveling.
This is the second water pic I’ve had of yours. My one problem is that I find it leaks water on the bottom when it’s standing other than that it’s easy to use and I like it.