Bought this back in December from Comet. In the store I plugged in my iPhone and played Hold on, I'm coming, by Sam and Dave, followed by She sells sanctuary by the Cult. Turned it up and walked around the store to see what it sounded like and you could hear it perfect everywhere in the store with no distortion. Even on lower volumes it has a full sound of exceptional quality.
If you are thinking of getting an iPod dock, pay the extra and get the Bose. Mine cost £149.