Been following this thread for a while. I can see why folks want to use them. I don't personally since I've got a meter. I had the reciept yet so I sent it back to Hangar 9 because some of the numbers in the LCD didn't work any more and it was still under warranty (they sent me a new one by the way. Thanks!) While it was away, I always bummed someone elses at the field before each flight. I never knew how addicted I was to knowing what was left in the battery. Even if it was plenty on the last flight, I HAD to check it again before going in the air. I can see where the voltwatch could be a great investment but I've already got a few bucks tied up in a volt meter. Either way is fine but the main thing is to KNOW what's in your battery.