That is awesome. However, 300 bucks for an input which you can make yourself for less than 50 is a little much. If it was 100 i would buy it in a second. However... i wish these people would have had the video/audio adapter before I bought mine a year ago.. theirs seems higher quality and better integrated. BTW, I think I used my DVD changer 5 times in the year that i've had it...
And to answer your question, I had it professionally installed... although I was just too lazy to do it. It's pretty straight forward... hook up into the OEM harness, and run the wires. I had the DVD changer installed under the cover in the trunk, where the spare tire should have gone... so when the cover is down, you can't see anything. Like I previously stated though, the sound is FM modulated, so it sounds like !Removed! - the solution that you have seems much better. If you can go with that, I would.