Dension-iPhone4s-audio hook up

[fastegg]

On ebay there is a Dension devise for hooking an iPhone4s directly into the CD input (unplug CD player first) $176 and $45 for the docking cable. ? I'm currently playing my music thats in my iphone thru a cassette adapter thingy. It works but sound quality not nearly as good as the CD.
Does anyone know anything about these Dension devices ?.... Dont really want to spend $225 only to be the guinea pig.....