I did the same. I tried a DAB on wheels kit. It was OK, but bulk as a dash add-on. I also had the Parrot add-on as well. When the satnav unit failed, I bit the bullet and got a newer satnav with DAB/FM/AM/DVD/CD/iPhone/Bluetooth, etc. all-in-one.
The only problem was that the Kenwood I bought was not well developed and has many faults and niggles.