I bought the aftermarket kit from ironcrossaudio. IMO the iPod interface works great.
iPod becomes an option on the radio display. You can play playlists through the radio. Scan through songs with handlebar controls. And I believe it's less than the HD version.
I have the HDPDPLUS, after I got use to the controls I am very happy. The button to scroll to the next song, if you hold it too long it will change the playlist. Just a tap of the button will change to the next song. Once I got that down I love it. Very easy install and if you have a question they will get back to you right away by email.
Greetings from S/W Missouri. I'm new to this Forum, but have found it very informative, as well as entertaining. I too and interested in adding an iPod interface and considering the Iron Cross Audio model. My question to those who know, when an amp is added, is it necessary to buy the interface relocation kit and if so, are there options besides the $200.00 HD model?