i see a lot of people ordering the 6-disc cd changer. i don't think it's worth to get the 6-disc cd changer. why pay all that extra money when you could just buy like an ipod and have just as many songs, or if you have a cd player you could plug that in to the outlet. plus you dont have to spend all that money on cds if you have an ipod. but the 7 speaker monsoon upgrade is well worth it, especially with that speed control function where is speeds the music up to compensate the outside sounds at high speeds. i have a huge sub box so it would be useless in the sky's "trunk" if you want to call it. so the mini sub that comes with the package is a solid investment.