Gary, I love mine, and figure it may have saved me from mid air or at least a few close calls. Yes, it is not pefect, it will not see anyone below and behind if using the built in antenna & on the dash. Mine will pick up my own rental 150 if the transponder antenna is dirty or when the batteries are low. I recycle it & it works ok again. Knowing traffic is at your altitude is enough, even if you don't know which way all you need to do is to adjust your altitude to avoid. Isn't that alone worth $500 & your life? It does not replace the 'mark one eyeball's" but it will provide a second line of defence. The new ones have a redesigned faceplate, my older one the large button broke twice ,but i find the little stub that remained actually easier for me to manipulate so i have not returned it for repair a second time. I belong to two clubs so being able to easily move it from A/c to A/C is a plus for me. Zaon has been faulted for poor customer service, but my experince with them was great. Quick return after repair. I find the batteries last me about 6-8 hours , but i tend to replace them at about 5-6. any more questions? I love my MRX!! DaveR