I really enjoy the JBL system. When I stream from my phone using bluetooth, the audio is always crisp. At lower volumes, the system sounds pretty good. At loud volumes, it sounds even better.
The only thing that bothers me is that the subwoofer isn't on a different line that the rest of the audio. In a higher end system, the sub would be separate. That way you could adjust the bass of the sub independently of the rest of the system. So you could turn the sub up a bit, then use the fader to send more of the sound towards the front of the truck.
But in the 4R, the sub is tied in to the rest of the system on the same lines, so if you use the fader to send more sound towards the front of the truck, you end up losing the subwoofer.
Does that make sense?
Anyway, even with that as a minor fault, I think the system sounds GREAT for a stock system. I do plan on upgrading, but this will work great for me for quite a while.
-Joel