I've had mine for over a year now, the biggest drawback is the lag time it takes to send and receive messages....oft times 15 minutes before it sends then another 15 minutes to hear the reply. They are not instantaneous like texting on a phone. They remind me of the first GPS devises commercially available to the public that took 30 minutes of wait time before it could get a fix on your location (and with only 5 hours of battery time on those early devises you better walk fast). I suspect that eventually things will speed up, but in the meantime they require patience to operate.
