Bests & Worsts Reviews from Amazon

I bought this to track my high blood pressure. It kept giving me suspiciously low readings. I have a "traditional" BP device - the type you wrap around your arm with the inflatable - which I believe is accurate (it checks well against doctor's office readings). These wristband reading were WAY off. Example: wristband: 125/82, inflatable: 175/110, taken at the same time. This is not a one-off - this is a consistent pattern. If you don't care about the BP and bought this for other reasons, have at it. I must say, I was generally very impressed with this device and all that it can do for the price. Until I found out it was wasn't doing it right. I am not in the habit of writing one-star reviews. But bad data is worse than no data. Especially in the case of health data, downright dangerous.