I have an older HU with an iPod cable I ran from the back of the unit to the passenger cabin. It's alright, it works. When Apple changed the voltage on their socket, I had to get an adapter to work with my iPod Touch. That adapter is very sensitive and doesn't lock to the iPod.
I have been thinking of upgrading to a new HU.
Because I already have a smartphone, it would be really convenient to charge the phone and play music off it at the same time.
I am looking for opinions of using one device for music, telephone, etc. versus two separate devices like I do now. I am looking for pitfalls, disadvantages and advantages besides those above.