I used these every single day at my desk, and the charge generally lasts the full work day.  Comfortable, functional and now I can't live without them.  I do think that the microphone is a bit sensitive to movement on your shirt or collar which can create a loud sound for your caller on the other end (so I try to remain still while on a call) but the stereo sound is good and the Bluetooth connection has never dropped from my phone once.  I like the ability to answer calls, skip tracks and control volume from the device.  They are light, and more than once I've left the house forgetting I'm wearing them.  Love these at work and while walking for exercise.  Cannot comment on their water resistance, as I don't use in the rain or sweat profusely while exercising -- but for my daily needs, these are great for taking tunes and talk radio wherever I go (housework, workplace, shopping at the store to relieve boredom, etc).  Had them for over a year and battery still going strong.