Review (3/5): Okay !  Dislike the "plastic" taste!
It's okay, but I'm not loving this water flosser and would not buy it again or recommend it.
Main reason -- Even after rinsing the "tank" several times before use, it makes the water have a "terrible" plastic taste. I did resolve this a bit by adding some of mouthwash to each tank of water before I use it, however I can not use it without adding the mouthwash because it makes the water taste terrible and did want to be able to use it with only plain water.
Secondly, it is rechargeable, but only via a USB connection, not a standard "home" electrical out as I had I expected (NOTE: It says it's 120/240V compatible) which is why I thought it would be charged via a standard electrical outlet versus a USB Port. USB is okay for those who own computers, (I do), but we certainly don't keep our computer in the bathroom. I have to charge it in my office, which is a bit inconvenient for a bathroom product.
On the upside, it does work pretty well, once you can get used the the water taste and it's nice that the are three settings. However, I feel the tank is too small and need to refill it for each use. One full tank is not enough to clean all my teeth, even on the "pulse" setting.
Overall, it's okay and does serve the purpose, but would be MUCH better if it did not make the water have the awful "plastic" taste and if the take was larger. If I could have returned it for a full refund I would have. But, since it's NOT defective and there is not a free trial period, I'm stuck with it. I'm going to use it for the time being and continue to look for a better product.