|I have a few Duncan Eagles and a few POM APM on the same street as a test to see how they hold up to the use of the public. As long as I have had the Duncan Eagles I never experienced any problems but only replacing the 9 volt battery after one year of use. I experienced some problems with the POM APMs but those nice folks took take of that problems for me in a quick and professional manner. Duncan & POM manufacture wonderful electronic mechs. They both have been very professional to me and there if any problems occur. Thanks Parker Harrington!