I have had mine for three weeks, and I am really happy with it so far. My experience with the unit is limited to DVD/CD, USB playback, Bluetooth phone connection, GPS Navigation and the Radio tuner. I have not hooked my Ipod to the HU, not do I have a HD Radio or Sat Radio tuner. To an earlier question, video playback is possible from the Ipod using the proprietary Ipod cable adapter, though I have not purchased the adapter and have no experience with Ipod playback on this unit.
-The sound quality is very impressive. It is much louder and seems to have better imaging and instrument separation than the Pioneer Premier (4V pre-outs) I was using for a year before buying the Kenwood.
-There are too many features to mention, and have not even touched the multitude of sound processing options available. So I could conceivably further improve the SQ by fine tuning it to my vehicle and my musical taste.
-The touch screen is very responsive, and after a couple of days use, the correct pressure and timing become second nature.
-The NAV is spot on, and very quick to register a signal and lock in the location.
-Bluetooth has worked perfectly. The caller comes through clearly and loudly, and from what they tell me, I come through just as well on their end.
I have not encounte.red anything I would qualify as a problem, but there have been some unexpected issues to get used to.
-The manual for the most part explains how to do everything, but not so much WHY to do something. In other words, it will tell you how to change an option but not always what effect that option has. I have directed a couple of questions to Kenwook customer service, and have thus far been satisfied with their help.
-This HU essentially has to boot into what is basically a mini-operating system, so for those customers used to the quick startup of a standard stock or aftermarket HU, the longer boot time of the Kenwood will take some getting used to. This is not a big deal, as most people will be listening to their music/navigating by the time they get out of their driveway.
-The most frustrating issue I have had has been with the USB usability. I have a large digital collection (over 2000 music files) and have filled up a 32 GB flash drive. Up until yesterday, many of my music files were not being detected by the HU. The problem turned out to be an issue the HU has with the directory/sub-directory layout on the drive. I initially had my files organized according to Artist -> Album -> Song, with each level being in a new sub-folder. I tried several iterations, until finally I just created individual folders for all my albums, each containing all the songs from that album. I am not sure what this issue stems from, and if a firmware update will eventually resolve it. Now that I have solved that problem, USB playback works fine. SQ is just as good as the other sources and navigation is very "Ipod like." After adding/removing music files or using a new drive, the HU must establish a new database by reading all file tags and organizing according to typical criteria (Album, artist, song, genre, etc.) and this can take nearly 5-10 minutes with a collection as large as mine, but that is to be expected. Smooth runnin after the database is created.