This little unit has the power all right-it felt like needles hitting my gums. I used the soft setting and it was painful. Also, the water tank ran out in less than 15 seconds so I had to refill three times for the first use. I will try it again and hopefully, it won't hurt. Otherwise, it may be returned to the company. Oh, and it arrived in an envelope, not a box. The inner box was a bit squished. No other apparent problems, though. After using this little unit for a couple of weeks, I have decided I like it after all. You do have to refill it a couple of times if you are like me and take your time. It has kept its initial charge from the second day I had it for at least 2 weeks now, without recharging! Very powerful-almost too strong for me at first, but I adjusted to it. It is made in China-which I would prefer an American made product but this is what I could afford. It seems sturdy enough and definitely powerful enough to do a good job.
This is the first time I have owned an irrigator and I am now convinced that this is one of the best ways to help clean your teeth. Using an irrigator can completely eliminate the buildup of methyl mercaptan in gum pockets and between your back teeth, if used regularly. This is something I've found impossible to do any other way.
Positives: Powerful water jet, well designed, fits in the hand well, has a 360 degree rotating spout, easy to use and responsive controls, doesn't require excessive cleaning, battery lasts a long time in pulse mode, comes with multiple replacement heads, charges from USB.
Negatives: The supplied USB charger broke after one day (doesn't really matter, you can plug the usb cable into any powered USB socket).
I've used the YASI V8 for around six months now and I think this device is great value for money and I'd definitely recommend it if you're looking to save money over a known brand. I only use the pulse mode, which extends the battery life and means you can just about clean your whole mouth with one tank of water.
Received this item around the November 1,2014 and it stopped recharging February 24,2015....The light on the charger lights up but not on the irrigator ..... charger does work...I swapped plugs around and used it on my Kindle...I will attempt to reach the distributor...I can't recommend this product