Smart Watch, S05 Fitness Activity Tracker with Heart Rate Monitor Blood Oxygen Meter Sleep Step Trac worth to buy? Thanks for it if those of you who have purchased Smart Watch, S05 Fitness Activity Tracker with Heart Rate Monitor Blood Oxygen Meter Sleep Step Trac could share about what you think of the product. I would love any extra info, as it is quite pricey as $59.98 and I just want to know it is good before paying for it.