S668 1.3 inch IPS Screen GPS Tracker Smart Watch for Kids, IP67 Waterproof, Support GPS / Micro SIM worth to buy? Thanks for it if those of you who have purchased S668 1.3 inch IPS Screen GPS Tracker Smart Watch for Kids, IP67 Waterproof, Support GPS / Micro SIM could share about what you think of the product. I would love any extra info, as it is quite pricey as $57.73 and I just want to know it is good before paying for it.