DZB 30M Waterproof Pedometer bluetooth Health Butler Long Life Smart Watch Silver worth to buy? Thanks for it if those of you who have purchased DZB 30M Waterproof Pedometer bluetooth Health Butler Long Life Smart Watch Silver could share about what you think of the product. I would love any extra info, as it is quite pricey as $33.91 and I just want to know it is good before paying for it.