I purchased this about a month ago and I guess it's working out all right. I haven't been in for a cleaning since the purchase, so I'll have to wait until then to see what the hygienist has to say.
I bought this appliance a month ago & so far I have been very pleased with the way it operates. I had the portable water pik that runs on a battery & it was not a very reliable one. Finally after going through 4 of the portable ones in 2 years I decided to change types. I am quite happy with the electric one!