Bests & Worsts Reviews from Amazon

I purchased one through Jenny Craig. At first was excited about the product and wore it for several days and synced the data regularly. What I noticed though was the activity portion was way off in accuracy. For example from the uploaded data: When I woke and had breakfast, got dressed it logged that I was doing vigorous exercise. Later in the day I ran a mile and it logged it as moderate exercise, no vigourous activity. I verified the location of the sensor on my left arm and it was in place in the exact location recommended. I had similar experiences the next day. Morning time which is quit for me had huge spikes in activity, but later on the stationary bike it showed only modest activity, even though I was churning out sweat and had a heart rate of around 140bpm for 45 minutes. Driving in the car also was listed as vigorous activity. I'm wondering if because it uses a 3 point accelerometer that the motion of the car was setting it off. This might also account for the stationary bike reading being so low, since you are not moving and neither are your arms. It seems like a promising start, but since the activity data is off, probably the calories are also. I just don't trust any of the readings from it at this point. I might work better for people whose primary activity is walking and running.