I have found the sound system to be very good, the sub woofer in the boot doesn't seem to be that affective, but then again being an old krinkly I don't have it on THUD THUD so that everyone within a 5 mile radius can hear it!
One little touch I like is that when the nav voice comes on the music is faded to the rear speakers
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The thing that winds me up about the Nav System is, it could have been better.
The maps are in desperate need of updating and if KIA are true to their word they should be available later in the year.
But like Cambo said - a lot of car for the money.