For the last few years I’ve been interested in wearable tech and I’ve ended up using a Jawbone Up for a lot of this time. They’ve been convenient devices to wear but in those few years I’ve broken two and lost one, so as a result I’m on No. 4 (an Up2 I think).
I’m not convinced of its accuracy, there seems to be a 12% error over a known course, which is a bit on the high side. However regardless of its accuracy, it does give me a reason to get up off my arse and walk more, so I try. I really like the software you use with it though, you can view trends and set reminders to get up and move after a period of being stationary, you can set wake up alarms and get it to remind you to go to bed.