This is my 3rd waterpik I really enjoy it and get compliments from my dentist, but I feel this particular model loses it's strength too soon. I will probably try a different model after this.
We previously bought an off brand one for our son who had just gotten braces. It worked for less than 2 months. So far We have had zero issues with this one.
If water tank were just a tad bit bigger & just a wee bit more pressure to the spray it would be perfect!! I am totally happy with it though and have already recommended it to my adult children.