I would also really like to hear more about the emfit QS (or the Oura Ring?)
I’m currently using a FitBit Charge 2. It works ok. The device seems to have no way of differentiating between me laying down or sitting still and being a sleep – I tend to watch an hour or 2 of TV before bed and I often lay in bed after waking up, which artificially boosts my sleep time by 30m to over an hour, so I’m constantly editing the logs.
I’ve had mixed experiences with the Beddit 3. Tracking has been patchy. The automatic tracking function is also redundant for me as it thinks I’m asleep whenever in my bed reading/just lying down. Also has a really annoying habit of muting the sound on my iPhone so I can’t listen to music/podcasts when going to bed. I’ve switched to the Autosleep Apple Watch app and just given up on it now.
I just found from experience that it would often confuse reading time with sleeping time if let on the automatic setting and so instead I had to switch to the manual mode which kind of defeated the whole purpose of the device for me. Might be a little better if you sit upright when reading and keep your heartbeat away from it but I tend to lie down which set it off. Have found wrist trackers to be far more reliable, if a little cumbersome and weird.
Beddit 3 is really nice app. I found it very useful and really liked it. Firstly it detects almost everything from sleeping to eating. Moreover, the calorie counter is fantastic. I am soon posting a review of it after using it long term about 5 months.