My wife has been asking for a water flosser for quite a long time, and I decided to pick up a completely cordless variety (no water tubes, no power cords). It's a pretty neat unit honestly, and although the picture may not do it justice, it is pretty effective at cleaning. She started on the "soft" setting, something like 20psi per the manual just to ease into it. There are further settings to ramp up to 140psi (sounds like a lot of pressure personally), but her family swears by these things, so guess it must be doing something good. What I can say is my wife is happy with the unit, and we've used it a week on the same battery charge. Water tank is 300mL, but you run through it pretty fast, so be prepared to refill it frequently if you plan to clean all your teeth. Other than that, it is a nice unit that'll hopefully last us a while. I'd recommend.