Pros: Reception, quality
The device is very simple and does an excellent job of transmitting the audio signal it receives to the car's audio system.
A light by the smoking adapter indicates it is operational, and thus turns on when it is connected to a 3.5mm device, via its aux connection.
I suggest cranking up the volume to max on your device, in order to get the least static noise via your radio (remember it is connected via 3.5mm like a headphone is)
The sound quality is actually surprisingly excellent. I'm quite the audio enthusiast and review a lot of audio gear myself, thus I'm usually quite picky, however this device has surprised me, on its sound quality. Of course don't expect a like-for-like reproduction, but it is as close as I would have ever imagined to get.
I highly recommend this device to anyone!
I should also mention the added plus of having a USB outlet on the smoking adapter, in order to charge your device whilst it is being played (cable not provided for obvious reasons)