We've own several of these Waterpik over the years. The only reason I had to purchase another is that the Waterpik gets dirty in areas I can't get to clean. For health reasons I choose to replace. It works great for my husband and I and for dental health we get great check-ups.
This is the fourth WaterPik product I have owned in the last 10 to 12 years and from the way it is operated since purchased approximately a month ago I think it will be the best.
i had a little doubt about the performance before i bought it, because i can only remove the tough stuff stuck in between my teeth by floss. never thought the stream of water can do the job. it turns out it can too.