Recieved my new CDA-9815 on Tuesday and installed it in my car that evening. I'm still getting used to some of the features but suffice it to say that the deck sounds GREAT.
MP3 load time is short and quick, exactly like it should be. I can't tell a difference between loading an MP3 track and loading a standard CD-Audio track.
The MX music enhancement is nice and the parametric EQ feature is killer! Have not yet had a chance to play with the time correction tables, but figure I will get into that this weekend when I have more time to play with it.
The Time Correction feature is one of the niftiest things about these newer Alpine head units and the older "high end" Alpines. I sat down with a measuring tape in my car last night and actually plotted out all of the speaker distances. Of course, being the American that I am, I went with inches rather than meters... but that's okay. Alpine's iPersonalize site allows you to do on the fly conversions, so I made use of that resource just to keep things simple.
Fit and finish are superb, much as one would expect from Alpine. The buttons have a firm, positive tactile touch to them. The rotary encoder knob is recessed a little more than on the 7894 and other previous similar units, which is ideal in my opinion. It is just large enough to use easily, but small and recessed enough that you don't find yourself accidentally hitting it when searching for other buttons.
The minor bits of "chrome" on the faceplate are actually more of a brushed chrome. Not near the bling bling ghetto styling of other decks with metallic trim. The gaudy Pioneers come to mind. Ugh. :P
The display itself is EXCELLENT. If you are considering the CDA-9813 or the CDA-9815, spend the extra $100 and go for the 9815 if for nothing else but the cool dot-matrix display. It is so much easier to read and pleasant to look at than the older LCD calculator-style displays.
And very informative too! The amount of information that you can bring up on this display leaves you playing with the "Display" button for moments on end.
All in all I am very pleased. Pics have already been posted in my gallery here.