I think most of Alpine's newer head units are set up with no real built in tuning specifically so you have to buy a separate add-on module, and they hope you'll be convinced IMPRINT is the end all, be all and give them the extra money rather than spending it elsewhere.
I hear IMPRINT cuts bass frequencies rather aggressively, getting you a very flat frequency response but a real-life sound that won't initially be right if you don't work around this. Also you have to experiment alot with mic positions and play with it a bit to make the computer do a tune you like. Seems like it ends up being more work than taking a bit of time to play with a separate EQ.
And once you set IMPRINT up I don't think you can go in and make tweaks and adjustments to the computer tune, you live with it as is or you start over. Probably a good alternative to using some of the instruments necessary to tune textbook style using a separate processor, or to doing the measurements for time alignment. Just ***** that you can't use it to get a baseline and then tweak it from there. I had no interest in it. I went to a Pioneer HU with built-in time alignment, built in sub, front, and rear crossovers, and a 16 band graphic rather than keeping my Alpine and paying for IMPRINT. I can adjust it on the fly as I want or pick any of the pre-programmed EQ curves and then adjust from there.
My pio also has a less elaborate auto-tuning system built in that sets the EQ curve and time alignment, all I have to do is plug the mic in, set it on the faceplate, get out and close the doors. May or may not play with it at some point.