On the whole I've been quite happy with Misfit Ray. It arrived quickly. After a nightmare with battery getting stuck sideways - sorted out thanks to Twitter feeds covering the same problem. It seems to be relatively accurate and a pretty good aid to my training. The downside: I chose not to have it notify me of messages or calls in order to preserve the battery life. Nevertheless after less than a month usage I have received an alert to tell me batteries are low. Perhaps it has been supplied with poor quality batteries but this is far short of the 6 months quoted which was one of my main motivators to get this. I will replace the batteries this time but will not be happy if they continue to drain so quickly.