I have CD'ed over twenty five IMAC type events, and have never seen a receiver, switch failure, or anyone land on one battery. The closest we got was a receiver that spit the crystal because the pilot mounted the receiver on the wing tube hence causing the "tape the crystal" syndrome. Not that it can't happen, but sometimes I think there is more hoopla then anything that actually happened. I just think of the famous line quoted by Mr Scott in reference to the newest Enterprise..."the more plumbing you put in, the easier it is to stop up the drain." this topic has been beaten to death many times over, but there are still some guys out there that insist that two receivers are necessary, and that off the shelf connectors are insufficient to handle loads - despite both being proven over and over to be hype.