I found myself swithering between 2 & 3 stars - I started at 3, but the more I wrote the less acceptable it felt. First the good bits. It arrived in nice, mostly high quality, packaging. It was relatively easy to get going, though pairing with my tablet took a couple of goes. It took a few days to calibrate, but started showing some stuff stuff immediately. The break down of the recovery score is interesting. Sadly, that's where the good bits seem to end: - the time to synchronise data with the app is terrible. In the morning, its 15-20 mins to get my sleep data in. The app isn't a big energy hog, but enough that I don't want to leave it running all day (and I turn stuff off overnight anyway). - this has knock-on issues. While syncing, other functions are worse than useless. I meditate first thing, but recording basically doesn't work. I get told the app can't find device (ironic given its syncing!) Sometimes that's it. Sometimes is starts recording. If it does, then it often the stop doesn't work as it sticks at 100% sync and I have to close the app losing the recording. Sometimes it records secretly and doesn't tell me it has done so until it finishes. One day I had two overlapping recordings (1.5 & 2hrs - should be ~20mins), another gave me 13hour. Even when it does record, the intermittent data collection isn't very helpful. I have a similar problem if I do evening exercises, where I can't even get an activity list until the sync is done. - the strap records almost no data during the day. If you read things in detail it hints at that, but still irritating. - it sometimes doesn't get my sleep timings right. At least I can adjust these in the app (unlike for the meditations), though disturbed how it can think I'm in deep sleep when I'm awake. - the three separate gadgets is understandable, but still a small pain - the first night it recorded 3000 steps while I sat watching the tv for 90mins. Support told me I must have moved my arm. That's a step (arm movement) every 2 secs while I was relaxing?!?! This hasn't repeated, but makes me lose confidence. - the arm heart rate monitor is a bit odd in its measurement. Shortly after the start of some exercise sessions. my heart rate drops to low 40s. It often then surges to ~120 before settling the 80s. Again, doesn't inspire confidence. - the strap design didn't totally inspire confidence as there's an obvious looking weakness (though maybe it will last better than I think?) The actual failure was different, as the back came off the stud. Full marks to customer support here as they sent replacements immediately. I bought this as a premium item, something that's more sophisticated than the run of the mill fitbits & watches, but I'm not convinced. The app looks good, but I'm not sure I have complete faith in the measurements. Even when it works, the analysis mostly just confirms how I already feel. But the functionality isn't good enough and, in my experience, too much of it feels like it is still closer to beta than a finished product.