I had the older Charge HR in the XLG. This allowed me to wear it on my ankle under a sock when not working out or exercising (i.e.: anytime I might not like the look of a FitBit on the right and nice watch on the left). I found it worked great, it kept track of my steps, HR and sleep.
The biggest benefit for me was tracking my sleep. I spend a fair bit of time traveling internationally and so I'm not always consistent in my sleep patterns and length of time sleeping. Before the FB I would often feel tired and I'd wonder how much sleep I was getting. It might sound silly to some, but I'm data driven and so seeing my sleep data helped confirm when I was getting too low on sleep and it led to a better focus on getting the sleep I needed. Unlike some people, I have found that I don't function well with less than 7.25 hours of sleep a night, and when I'm traveling or working long hours, I sometimes struggle to hit my needed sleep level.
Unfortunately, my FB Charge HR stopped working about a month ago after warranty period was over, and I haven't yet decided to replace it. My travel schedule has been lighter if late and so the sleep data hasn't been as important.
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