I bought an off brand version from Amazon and found it didn't do anything. After, I decided to get the brand name Sonic Pro and do a side by side comparison. The Sonic Pro worked way better than the other. I can see the Sonic frequency agitates the water more visibly than the off brand one, and the noise is slightly louder, and the device is slightly heavier.
So, despite both units having the exact same specs, the Sonic Pro works much better. I also got the cleaning tablettes and like them. I wish I had bought the water flosser now.
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