Review (5/5): This thing is like a pressure-washer for your mouth
This thing is like a pressure-washer for your mouth! I have to run the sink at half strength. It really does a great job of cleaning your gums and between your teeth. A good price, too; and it should pay for itself in a couple years, since I won't have to buy bags of flossers anymore. And it's way less of a hassle than other water-flossers, since it doesn't require electricity or a manually refilled resevoir.
UPDATE: I recently moved, and this is not nearly as powerful at my new place as it was at my old, because (as it turns out) the maximum throughput of this waterflosser is dependent on the maximum throughput of your sink. However, it still works well, and the low price, unlimited water, choice of water temperature, and lack of need for electricity makes this still better than an electric waterflosser.