I bought this FitBit Charge 2 as a last effort with FitBit. I have had two disappointing experiences with them so far. My first Charge HR battery life was only 3 days initially, then dropped to less than 1 day after 14 months. It was advertised at 5 days battery life. The replacement Charge HR battery life was always 5 days, but after a year the strap portion started coming unglued, and finally broke at the intersection with the clock section. At $149 per unit, it should last longer. I expect a 5+ year life out of such a product. So as a last ditch effort before I switch to Apple Watch, I bought this Charge 2 two days ago. So far it is an upgrade in both looks and features from the Charge HR. However, the first night gave me full Sleep Stages analysis, but the second night it did nothing. It just recorded the time I went to sleep and the time I got up, nothing in between (see photo of the log). I don't know the reason, and need to solve it, because tracking sleep quality is important to me. Therefore, I'm cautiously giving it 4/5, and will edit it up or down based on my findings.