In my very unscientific testing of the heart rate sensor during a couple of spin classes where I compared the Ionic's wrist reading to a reading from a chest strap, I did notice some discrepancies. (theverge.com)
In a completely unscientific test, we discovered that every time we put our toddler in the pool in the morning, he napped like crazy that afternoon. (parentingsquad.com)
As far as I am concerned, I am going to go with my very unscientific test: how my eyes react to the displays. (gigaom.com)