After using it for a couple of weeks, I've noticed it causes my teeth and gums to become sensitive even with low pressure, so I don't use it every day. I use it twice a week, and the rest are regular dental floss. Overall, it's a great product concept.
I use a highly rated electric toothbrush first, then the water pik. I am amazed each time at how effective the water pik is in removing the residual bits and tartar from my teeth left over from the brushing alone. My mouth definitely feels cleaner!
I am pleased with this water flosser after about 6 weeks. The flosser handle itself is nice and thin, so it's easy to move it around your mouth. The only thing I don't like is how the water hose connecting the handle to the main unit is coiled and doesn't like to straighten out, which can affect how I hold the flosser handle when flossing. This unit would be much easier to use if the hose wasn't meant to stay all coiled up. But I suppose it stays coiled so it fits in the unit for traveling or something. I'd be much happier if the hose wasn't coiled.