One of the frustrating features of the iWatch 6, is the blood oxygen readings. The sensor on me has to be just so, and it might take a reading , but mostly complain that the watch isn't high or low enough on the wrist too loose too tight and when I do get a reading, doesn't do it unless I go through the routine to get it to function. I am close to just using my iHealth finger unit and be happy. The heart rate works just fine. My new concern would be , the blood glucose feature, if the sensor is built into the watch, will it be a pain in the tush like the oxygen sensor, or will it be something that can read an attached to the body device ? Does anyone else have issues with the oxygen sensor actually taking a reading?