I listened to myself talking on my Cobra 129 ltd with the stock mic. compared to the Astatic mic. I used a tape recorder, sitting next to a walkie-talkie at home while I drove around. There is a noticeable difference. The stock Cobra mic. sounded loud and overmodulated, while the aftermarket Astatic was clear. I'm actually enjoying listening to the difference over and over. I guess there is something to be said for good microphones. I'll keep the stock Cobra mic. for a spare, but it just doesn't compare to the Astatic.