Earlier today I did a very basic test with the Sound Shark Parabolic Collector that uses a basic LAV mic to record distant sounds. Placing a small speaker 20ft away I compared the difference between the PParabolic Mic setup vs a pretty standard on-camera Azden SMX-30 microphone.
I also recently had the opportunity to test the Sound Shark Parabolic Microphone in a typical classroom setting. I found that it really helped to get that louder volume from the distant speaker when compared to other microphones that I would have traditionally used.
Now while a Parabolic microphone will definitely pick up distant sounds better than any other type of microphone, it should not be considered a replacement for other microphone types. It really should be considered a different type of microphone and possibly one you may want to add to your audio kit. If you're interested in listening to other examples, you can find videos on their website at http://KloverProducts.com/SoundShark.
The unique shape of the parabolic collector is used to collect incoming sound (pressure) waves and focus them onto a single point where the microphone converts the collected sound energy into an electrical signal. Because the sound energy from a large area is focused onto a single point, the sound is in effect, amplified. This is the same technology that is used to capture the sounds of the game during professional football games every weekend.