I bought a Zaon MRX earlier this year and I have been very pleased. It
is a small, passive system that only requires me to turn it on before
flight and turn it off after the flight is over. I bought it at Wings
and Wheels for approx $ 500.00 and I do feel that it a very valuable
safety device that folks should really consider purchasing, especially
for those operating in areas with a fair amount of commercial jet
and/or general aviation traffic. I operate out of Moriarty, NM (30 NM
East of Albuquerque, NM) and we have a fair amount of jet traffic
descending toward the Albuquerque International Sunport or climbing out
on departure. The MRX has really worked very well alerting me to
aircraft that get within 5 NM and 5,000 feet! - 3R