I love my Trackimo.
When I'm not flying, I tuck it into my 8 y/o's backpack. Gives a little peace of mind where I can pop open the website at work and see where she (her backpack, at least) is during the day, as she moves around from class to class. It's accurate enough that I can tell what room of the school she is in by the location on the map. (i.e. Now's the time she should be in the art room...and sure enough, the tracker shows her in the art room)
I figure why not...beats the tracker just sitting in the house doing nothing all week when I'm not flying.