I'm a long time member over at diymobileaudio, and the Sony gets some love, but honestly, I don't see it having much of a future. Firstly, hi-fi audio is dying. People don't listen to music actively like they used to, people listen passively, while they do something else. People are satisfied with crappy Apple earbuds and have no interest in things like the staging and imaging of an album. In a car it's even worse. It is becoming increasingly difficult to add a simple aftermarket head unit to new cars, and most people aren't interested enough to drop the cash on a DSP and the time to tune it. I think the Sony is a neat piece, but the screen is awful, it's far too expensive, and there are very few systems good enough to hear the difference in hi-res and a well recorded lossless file.
Having built a very impressive system in my Subaru, I'm slowly putting something together for the GTI, and I think I'll end up running a DAP straight to a DSP/amp and just leave the OEM headunit as is. I put a Pioneer double din in and hated it, then I put in a Kenwood and hated it, I'm back to the OEM head unit and I hate it, but I'd rather hate a free head unit than to hate one I spent $800 on.
Head over to diymobileaudio and read up. There is a lot that can be done to improve the sound in our cars, depending on how much time and money you're willing to spend.