Add on iPod adapters sound good but the controls suck. The best controls are on the video units or models like the Alpine iDA-X100. They are designed from the start to control an iPod. Your factory deck is not designed to control an iPod so most interfaces are using a CD changer input. The controls are minimal and clunky. Some of the interfaces allow you to control the iPod from the iPod. Worst case, you can use a HARDWIRED FM modulator and it will sound decent.