I've been using the Flytrex live for a little over a week now. I first tried using it with AT&T. In my area the 2G coverage from AT&T is pretty sparse. I found a coverage map that was helpful.
http://opensignal.com/
I have since switched over to T-mobile which has more 2G coverage in my area. That being said 2G coverage in my area is still a bit thin.
My intents for the Flytrex live are that it would provide me what the Flytrex Core 2 provides, live, and it would replace the need for another GPS tracker for emergency loss. My other thought is that it would provide me telemetry when I was out of range for FPV, control or even Datalink for GS sorties.
What I have found is that often mine will not connect and start a new mission (green flashing LED on the live) unless my bird is in the air most of the time. This is a bit annoying as it create errors in elevation when exporting KML's and it must be adjusted for is Dashware to have the elevation be accurate although on the Flytrex website it appears accurately.
One misconception I had about the live is that I read somewhere that it may have a couple seconds of lag but it would always cache the GPS recordings so they would be transmitted later. This is not true I have had flights where the signal dropped for more than a minute and the data from that time is lost. This is an issue for me because it erodes the value of the live as an emergency locator.
The other annoyance I have with the Flytrex live is that once a mission is complete it disappears from the live web site and doesn't reappear as a completed mission for 20-30 minutes. Again if it was an emergency this would be a problem. This I hope they will fix with better servers and software on the server side.
So overall its pretty slick when it works but definitely has its short comings. I hope Flytex goes back to the drawing board and creates a 3G or better 4G/LTE module because the coverage would be much better in the US. I'm also hoping Flytrex can improve the firmware on the live so that it can cache the GPS data when signal is lost.
The Flytrex live has a USB port on it and I also read somewhere that the data could be extracted from it however I have seen no software tools to do so. Again the data doesn't seem to be cached currently.