I replaced my table-top WaterPik with this cordless version. It's very convenient, but not as powerful as its predecessor. It's a bit trickier to manage in your mouth, and doesn't drain as well either, but all in all, I like it.
I've own this product for a few weeks, and can't say enough about how much I love it and wish I had bought it years ago. I don't like using dental floss, and this product does a better job, more throughly, quicker and with more ease. I would recommend for everyone to buy one.