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.
I bought my waterpik one and a half months ago. I was very satisfied with it until the pause botton on the handle stopped working. I called and had a new handle sent to me. I am happy to have it working again.