I got the same one. I only wear mine while exercising, so battery life is more than adequate even with continuous heart rate monitoring enabled.
My problem with it is that the heart rate measurements are always in the 60 to 100 bpm range, while another source is reporting around 140 bpm during exercise. It does not appear to handle higher heart rate values very well.
Secondly, the watch is only compatible with the Polaroid app. The user interface isn't great and the data it collects cannot be exported. It would be much better if there was an option to sync the data with Google Fit or Samsung Health.

