I've got CGRetired beat. I have a grand total of 8 Airtronics radios (that's all I fly with). I have a RD6000, a Quasar, a Radiant, and 5 6 Channel Vanguards. I have never had a lick of trouble from any of them and I fly the living dog snot out of my planes. They are very high quality equipment and I'll never use anything else.

That's my 2¢ worth

Ken