Mine runs fine, but when I first got reflex I got the plug to fit an FF7 (spare radio) and it would not work well at all. On the reflex site it says something about the impedance in the module being incorrect for FF7 radios. There are details on there of how to modify the module to fix this, but I did not want to take a soldering iron to the module when there was an easier way to fix it. Apparently newer modules don't have this issue.