I purchased this at Target on sale before Christmas and started using it right away. It is very easy to use. I love that it holds a lot of water so your flossing is quick and easy to do without stopping to add more water. It is powerful, so start on the 3 or 4 until your gums get use to the force.
This is my third Water Pik and I can tell you it makes a huge difference in keeping your teeth to a ripe old age. Use it every day including taking the travel version when I am away from home.