Cell Coach - Distracting or Lifesaving?

In our January e-newsletter, we introduced readers to a new device on the market - the Cell Coach manufactured out of Tucson, Arizona. The Cell Coach was designed to put an end to driving while talking/texting on cell phones especially for teen drivers.

Installed under the vehicle's dashboard, the device emits a loud alert when it detects cell phone signals either from the driver making a call, answering a call or attempting to send a text message. The sound, a 90 decibel alert, is so loud and annoying that teens can't help but hang up, concentrate and drive.

Some teens that have tested out the product say that it has made them stop using their cell phones completely while driving.

If you've used this product or if you know of someone who has, we're interested in hearing if it's been helpful and whether or not the shrill sound of the alert distracts the teen driver. Also, how long does the alert sound after the teen has hung up the phone? We think this is a good idea. What do you think?