The Monster ICarCharger also has a miniplug in the dock port but it does not have an amplifier as does the Belkin adapter. The sound quality is much better from the miniplug at the top of the ipod as compared to the miniplug on the dock port of the Monster adapter.
As for Best Buy's install, I didn't even look to see how they wired the Commander. I'm assuming everything is velvet though. The installer did however, leave a few scratches on the left side of the 4WD knob. Nothing a little Armor All couldn't take care of.
On an aside, I've actually taken out my visor CD holder as well as all of my CDs from my truck. Between my ipod and XM radio, I'll never run out of good tunes.