# occasionally see totally wrong readings (e.g., heart rate was consistently in the 50's and suddenly got one reading in the 90s when I wasn't doing anything; respiration between 12 and 18 and suddenly got one reading of 30 while I was asleep) # can't distinguish sitting still from sleeping; # no way to mark sleeping periods as actually asleep; # setting up and tracking exercises is much too complex (paper and pencil is a LOT better); # time gaps in some measurements but not in others; no answer from customer support about any of the above issues finally, website did not work for a return and a customer support person had to set it up by hand