Ironically I purchased it for the vibrating function but use the beep more often. I was hoping the vibration would be as strong as my old Motorola cell phone but sadly it's not. That phone had an earthquake vibration. Most reviewers complained the beep was not loud enough but it is actually perfect for me.
It's tiny size is perfect for travel. It has a cool little kickstand for your night table. Setting is easy. Background light is just right. Functional snooze. My only grip is that it does not have a turn off button. You have to slide the setting bar over to end alarm. Other than that it's an awesome alarm.
It's hard to find a travel clock which is small and light as well as using a regular battery. This is the only one found so far. I do not use the shake function but I do find that the alarm is not very loud. Would rate excellent if the alarm was louder.