Fitness Trackers, Smart Watch with Heart Rate Monitor Step Calorie Counter Sleep Monitor,1.3" TFT Co worth to buy? Thanks for it if those of you who have purchased Fitness Trackers, Smart Watch with Heart Rate Monitor Step Calorie Counter Sleep Monitor,1.3" TFT Co could share about what you think of the product. I would love any extra info, as it is quite pricey as $39.99 and I just want to know it is good before paying for it.