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!
I had the smaller one that you charge WP360 & it does not hold up - I have purchased 2 of them and they only will charge for a year - then nothing. The dentist said I had to use one. So I hope the WP100 holds up better. So far I am very happy with it.