I had Fitbit Premium for the trial period and really liked the daily readiness scores but realized it is using zone minutes as one of the tools used to calculate. I workout a lot and average 160 to 185 zone minutes a day but I never relied on it because I always noticed the heartrate is often off. I use elliptical daily with low intensity and my heart is low 99 to 106 and Fitbit reads 130. If the heart rate is off then the zone minutes are off then the daily readiness score is not accurate. I have had a 3 fitbit charges and I really like the Sense, but to pay for the premium if its not accurate seems like a waste of money.
