Im thinking of getting one of these for MY06 STI as you can adjust the level of sound from inside the car. My main reason for looking at this is my other half needs to drive my car on occasion so I thought it would be good if she can turn the DV off.

Has anyone got one of these or seen one fitted to a Scoob?

If so whats your thought on them? Are they any good? Would you recommend one or do you think they are temperamental?