I love my Autocom! It's very versatile; has many different connectivity options. It comes with multiple inputs allowing you to plug in phone, MP3, Satellite radio, radar detector, GPS, two-way radio, bluetooth, and a passenger headset.
When I first got mine, I had my phone, MP3, XMradio, two-way (walkie-talkie), and passenger hooked up.
I since upgraded to a Zumo 550 and the bluetooth module. Now, the Zumo is my MP3, XM radio and phone interface! It is bluetooth connected to the Autocom. Then I still have the two-way for bike-to-bike (works with Chatterboxes), and the passenger lead.
This means that when I'm riding, I'll be listening to tunes (MP3 or XM) and when a phone call comes in, the music cuts off and all I have to do is touch the Zumo screen and answer the call. When the call is ended, the music continues. When I'm riding with a group, my two-way is in the hump and I have a PTT button mounted on the left grip; I used the two-way on the group ride at the fall bash. MC Mustang also has an Autocom and he and I were both chatting with each other and all the other guys with Chatterboxes.
Doyle -
check out this thread, it has some pics of my setup, including the Autocom, the PTT button, Zumo, two-way, etc. I mount my phone on the tree only to plug it into power. Otherwise, it will just sit in my Bagster since it's Bluetooth attached to the Zumo.
Let me know if you have any questions!