Top positive review
I would recommend, with caution
Reviewed in the United States on March 10, 2018
I would recommend, with caution. I bought this after reading a lot of reviews and determining this was the most accurate sleep monitor. My thinking was, If you can't trust the accuracy of a monitor, the data is going to be useless to you. I bought it for my sleep problems. I am not an athlete so I didn't use the heart rate variability data etc.
Setup was super simple. I was able to connect it to WiFi simply by pressing the button on my router, then using a paper clip on the Emfit QS. My sleep info gets sent to the internet automatically and reliably and it is always there in my browser when I wake up. The only problem I had with setup was I have a very thick mattress with no box so I basically had to slice my mattress open and put the sensor in under the mattress pad.
It gives you a lot of information, from which you can piece together how you're sleeping. However, as I found, you cannot rely 100% on the total sleep and sleep stage classification. The accuracy of these numbers is questionable. For instance, my child was lying in my bed reading for 2 hours and apparently not only did he get 1.5 hours sleep, but he got 1/2 hour of REM sleep! Pretty good for being awake!
Having said that, I have reason to believe the toss & turn data is accurate since the sensor for this is pretty basic so you can use this data to clearly figure out when no sleep is happening and do the math to figure out your total sleep. So in order to keep track of my sleep I need to analyze the data, add up the numbers, and keep a separate spreadsheet. Not everybody's willing to do this, but it works for me (so far).
I am planning to buy a Fitbit Alta HR so I can compare results.