Sport Smartband bluetooth 4.0 Heart Rate Monitor Pulse Actively Fitness Tracker Sleep Smart Bracelet worth to buy? Thanks for it if those of you who have purchased Sport Smartband bluetooth 4.0 Heart Rate Monitor Pulse Actively Fitness Tracker Sleep Smart Bracelet could share about what you think of the product. I would love any extra info, as it is quite pricey as $17.49 and I just want to know it is good before paying for it.