i had a cheaper dension unit in my saab and r129 for last 6 years and worked great with ipod and the active cradle was fantastic but it did not work with the newer ipods/iphones and i thought about getting 500s BT for my SL (r129) but decided it was too expensive and went for a pioneer deh-4400BT radio instead as it is cheaper and easier to install (just swapping out the radio and job done)