Worth replacing - once!
Mine lasted 4 months before succumbing to the design flaw mentioned by several others, which is that the device is not well anchored to the elastic band and can fall off and get lost during relatively normal handling of a water bottle. I had silly aesthetic worries about sticking a piece of black velcro tape under the translucent clip to prevent this & tried to improvise further with a lightly adhesive clear product, but evidently not adhesive enough.<br /><br />While I had this little device, it actually did exactly what it said it would do and I found it very helpful. It won't take you by the hand & pour the water in your mouth, it's still a tool you have to make the choice to use rather than ignore or leave on a shelf. But if a significant part of your water-drinking problem is that you get too engrossed in your tasks or lose track of time and just forget to drink, this may be the reminder you need.<br /><br />Really at this price point the manufacturer should just add a little snap or anchor or bit of velcro themselves, and I wavered on the affordability & value of replacing it. But decided I will one time since it remains the only such product I've found that I can move around to different bottles, glasses, and cups depending on what I'm drinking and what dishes/bottles are dirty, rather than having only one reminder-equipped water bottle. If the second one goes AWOL, I'll just have to hope the time I did have it gave me better hydration habits and do my best sans technology from there.
Rating: 3 stars