iPod users, beware. I completely agree with the other reviewers that the sound and picture quality are way beyond great. However, if you are planning to get a KCA-420i and navigate your iPod from the touchscreen, you may be disappointed by Alpine's hacked together iPod solution. The main problem is that the ability to get to a specific track is very slow. Given the options of album, artist, or playlist search, and my iPod with 400 artists and 2000 albums, I had to resort to what most 310/420 owners have done: I created an iTunes Smart Playlist for each letter. So, click search, playlist, click 10 times to scroll to L, click, click 30 times to get to the artist, click, click on the album, and finally click on the track.
As a result, I spend most of my iPod listening time using MIX Songs mode, which I frustratingly have to turn back on every time I power on the unit. It can remember that I want an 80hz low pass on the subs, but can't remember I want MIX on all the time.
It seems Alpine acknowledged the problem by creating a half-solution hack called Percentage Search that jumps around in 1/6ths of all your music. Unfortunately, they implemented it on the lower end D100, and left us D310 users without a retrofit. Alpine further acknowledged they blew it by creating the IVA-X001's iPod interface, and continues to leave D310 users out in the cold.
So my advice would be to wait a few generations on anything Alpine does. Eventually they'll get it right. Read a few reviews on their Bluetooth integration, you'll understand why I still have a Parrot.
Still, don't get me wrong. I make up excuses to get in my car and listen to music. Sometimes, I'll get where I'm going and wait for the track to finish. I spent 4 months listening to systems, but slacked on getting all the details about functionality.
Buy a D310 and love how it sounds, but realize that no matter which iPod you have, once you get in your car you essentially have a Shuffle. I've owned a D310 for over a year now and love every minute except when I want to search my iPod.
