My thoughts on the radio (single disc w/Infinity 7 speaker sound)...
My TJ I had a aftermarket setup with 2 fosgate amps, 1 fosgate 10" sub in the center console, 2 5.25 2-way Cerwin Vegas (in the dash (a mod)), 2 6.5 2-way Infinity speakers in the soundbar and a Kenwood cd/mp3 deck.
Honestly driving around this weekend with my Sahara (4 door got it saturday) Its shocked me the loud, clear, and crisp the sound is. Good solid punches (has 4 6.5" speakers (two in dash two in overhead soundbar) w/tweaters pointed directly at you and the 8" (or 10") woofer in the back) good medium range and crisp highs. I would say the system is just as good as the one from my old TJ.