Not to rain on anyone's parade...
I have installed one of these on a customer's 2002 Lariat Srew. I work part time at a local audio shop. The unit itself gives out poor sound quality even with 320 kbps format on the MP3 file.
Now with all the experience you've had using the stock head unit and working with the SQ after the HU, you know your audio gear real well. You tweaked your system around the HU and that also works at some degree. You had amazing results because you improved your other audio components. But stock for stock, it's no better than the stock unit, just plays MP3 files.
Audio SQ would much be cleaner, like St Louis said, if there was a dedicated sub output. It sounds "boomy" when the x-overs are not set right. And the bass is not as "tight" or crisp when you listen to it.
2003 FFW-Palmdale, CA - Tough Truck Winner
2002 HD Black
1996 Probe GT