For people with big wrists it does tend to dig in a little either side of the main body and the ear piece can jump out if not attached properly to the main body. The strap can be a tad awkward to put pon but once you get the knack of it its ok. Charging is a doddle, just peel back the end of the strap to reveal a usb, slide that end into the usb port on your computer and off you go.
Screen is easy to read and informative and the B1 will notify you when you've been sat around for too long.
It is a great "plug n play" gadget and apart from a few teething problems I use it every day and haven't missed a call since.