Bagman -
My brother and another friend of mine have
the HK Go from Harman Kardon and I'm always amazed at how good they manage to make a little speaker system like that sound.
I don't have a lot of boombox systems to compare against that I've heard first person, but this one does a nice job (which I guess it should for what it costs).
Like John said, it's not going to be audiophile quality, but for a boombox, it's not bad at all.
If you are interested, watch HK's store on ebay for deals on refurb units as they sell considerably more cheaply there than new.
Jason