I got a chance to play with the alpine w505, kenwood 8120 and the pioneer z3. I have to say it was really a let down. I flipped through the main functions and messed around with the gps, but there was not ipod hooked up to them.
The kenwoods screen is garbage, it looks like it is 10 years old next to the alpine and pioneer. For how much the kenwood costs, I would not buy it because of the poor resolution. Every function is grainy, dim and just looks terrible in my opinion. Although the overall functionality is probably the best, I just cant get over the screen.
The kenwood definitly had the best gps interface. The alpine had the worst, and the navi interface was grainy and dim as well. The pioneer was in the middle, but had a clear, high resolution navi.
The alpine w505 screen is beautiful, it is clean and responsive. It is expensive and I would buy a seperate garmin instead of the alpine navi add on. The overall interface was easy and clear. The kenwood interface was about as intuitive. The pioneer had a really nice screen, but the interface was not as intuitive as the kenwood or alpine.
I am thinking about getting the alpine w505 with a garmin nuvi 780, unless the new kenwood and eclipse lines really step it up. It would be kind of nice to have ipod control and navi at the same time.
In my opinion the technology is way behind everything else. The components are severely overpriced, for what they are. You can buy a mini notebook pc these days for under $500 that is far more advanced. Just think of what other electronics you can buy for the price of these screens.