Good, but could be better. Runs out of water quickly, and it's impossible to drain completely without removing the water reservoir from the unit. But I'm getting used to it and hope it's helping my dental health.
I cannot live without a Waterpik! I have gum issues before purchasing my first ones years ago and my gums dramatically improved! My dentist was ready to send me to a Periodontist and by the next visit, he said that was no longer necessary! I even travel with it too!
I've had a Waterpik 580 for 3 years now. My original finally gave up the ghost. I orderedd a replacement but had to return it on 2 weeks because it became defective (wouldn’t pump). Replacement arrived and its going gangbusters.