This thing is SO cool. I use filtered Brita water so I don't feel the need to use the sanitize option, but when I do, I honestly can't taste a difference. But, I LOVE that it measures how much fluid intake I get and when I drink. I haven't explored the app much, but it would be kind of nice to see a graph or some kind of chart that shows the averages of times and amounts, etc or whatever (I'm nerdy like that). The light is unobtrusive when it notifies you, and also functions as a battery life indicator so it has multiple functionalities. I've dropped this a few times and so far it seems to be durable, but I wouldn't go out of my way to test that theory intentionally given the technology built into it.