I have two opinions that are preventing this from getting a five-star review. #1 - I wish there was a headphone jack on the device. Not everyone has full sensitivity in their hand/arms to feel the vibration, due to nerve damage and whatnot. Plus, the vibration makes noise too, and it would be helpful if the device did not for times when discretion is important. #2 - the device, while not huge, is larger than other devices with similar features. Though from my research and experience, those devic...