That was the one I had, it was great, as long as you didn't drive into different regions, at that point you would get interference as new stations would come in near the frequencies you had chose to transmit the FM signal from the DAB unit.

Now, it is meant to swap between your 3 chosen frequencies, but unless the signal was stronger than the DAB unit, it would not do so.
That is why the thought of having a hard wired FM lead is so appealing. Porsche 911 (996)
2015 BMW 5 Series Touring
Not got a LR of any kind at the mo, and got itchy feet.