I regret not trying this product sooner. I find it so much better for flossing, something I rarely did before, but now enjoy twice a day. The unit is excellent in all regards and I'd replace it with another if mine wears out.
My hubby and I each got one of these when we saw them on sale. A little skeptical at first , since I have sensitive teeth, but it really does a great job. Just use warm water in the tank. Ours came with the base unit and a portable one, which works out perfect for us...I use the base one and he uses the portable. It IS a little messy and a little bit loud, but other than that,...so far so good.
I bought one for my son as a Christmas gift and one for myself. I like to use Listerine in the tank as it gives a nice finish. Just try out all the nozzles and you will be surprised how well the flow works and they give you an extra clean feeling.