I bought this a few weeks ago and thought it would be better. The stream is not powerful enough on high, and it also runs out of water quickly. I usually fill it up 3-4 times per use. I haven't noticed a difference in my teeth or gums either.
No, I would not recommend this to a friend.
Response from waterpik.comBy Waterpik, Product Support Team, December 17, 2018
This model is intentionally designed smaller for travel and for those that have little counter space. It sounds like a counter top model would be a better fit for you. They have much larger reservoirs and a broader pressure range. We do offer a 30 day money back guarantee. I would be happy to look into this for you and help guide you to a unit that would better suit your needs. You can email me directly at smreviews@waterpik.com or call customer service at 1-800-525-2774 Monday through Friday from 7:00am to 5:00pm Mountain Time for assistance.