I bought this watch because I wanted something that I could use as a silent alarm so I didn't wake the little lady when I needed to be up before her. Unfortunately (for me) I'm a heavy sleeper so I was hoping the vibrate function on this watch was going to do the trick. On one hand the vibration is pretty strong which is great for when I'm already awake. On the other hand the vibration only lasts for 10 seconds which isn't long enough to draw me out of a slumber. All in all the design is a bit counter intuitive but for a hobby fisher that needs to know the moon cycle and is willing to learn all of its features I'd say its a decent watch for the money. I'm not overly ecstatic about the purchase but I'm using it none the less.