I have a Fitbit One. I clip it onto the inside of my pocket. It gets snagged on things like seat belts, climbing harnesses, etc but I can't find a better place for it. According to the directions, women can clip it to their bras, though that doesn't seem comfortable.
I broke one by putting it through the washer with clothes. Fitbit sent me a free replacement unit even though it was completely my fault.
Once every month or so it will randomly shut off during the day. I don't look at it constantly through the day (or look at the app), so I don't get that day's record of steps, floors ascended, etc.
The feature I like the most is the silent alarm. I wear earplugs at night as I am a light sleeper, and wear the Fitbit One in the cloth wristband they give you. It vibrates lightly on my arm and wakes me up without loud annoying alarms.
I charge it once every 7 or 10 days (depending on my activity it seems). It requires a proprietary charge adapter, but it plugs into a USB port. Needs Bluetooth to sync to your phone (won't work with Google Nexus 7 2013 edition as the bluetooth is too old). They include a bluetooth adapter for your computer if you need it.
My friend recently got the new Fitbit Surge. I tried it on, but because I don't have huge wrists, it wasn't comfortable to wear
If you want screenshots of the online panel, let me know.