Just to let you guys know I happen to work close to an outfit with working mode S the size of a bleeper and about the same cost. and having seen the thing in practice it is truely amazing it will make ALL kinds of flying much safer and has applications you guys dont evan know about yet, like having a TCAS style system for less than a grand where you can send massages to the other A/C your self. And how about a flying instructor being able to monitor their student on a X-country flight from a laptop in the office. it's only good stuff guys and it will be ready soon THIS year .