D100 Elderly Heart Rate Monitor GPS Tracking Communicator Tracker Watch, GPS+LBS+WiFi, 1.54 inch Tou worth to buy? Thanks for it if those of you who have purchased D100 Elderly Heart Rate Monitor GPS Tracking Communicator Tracker Watch, GPS+LBS+WiFi, 1.54 inch Tou could share about what you think of the product. I would love any extra info, as it is quite pricey as $102.19 and I just want to know it is good before paying for it.