I bought this device the same time I bought my first ipod. This is a device that has two functions it transmits the music from your ipod on an FM frequency so that you can play it in the car. It also charges your ipod which is a big bonus.
This is a simple device that you plug in, tune your radio into the frequency it transmits on (which is shown on the bottom of the device) and go ... it's that simple. So 10 our of 10 for ease of use.
You now have your ipod library at your fingertips. Not just in your car but any car. So 10 out of 10 for practicality and adaptability.
There are two issues with this device. If you go on a long trip the free frequency you are using may become "live". If this happens you can hear interference in the backgound. This can be eliminated by changing the frequency the ipod trip transmits on.
This brings me onto the second issue. The ipod nano car trip is designed to stick straight out of the dashboard. To change tracks/albums you have to take your eyes off the road as it's not designed for the driver to easily see the ipod display. This also applies to changing frequency.
Because of this I have to give it a 0 out of 10 for safety as it doesn't work with the new road traffic laws or changes in the highway code. However, if you can get around this issue then it is a nice gadget that works well.
I also have to give it 10 out of 10 for value for money. Worth every penny.