'"They all do that' isn't a lack of service if they actually all do that". I'm told by Colorful that it does appear to have a fault, it should not rattle. Also, the seller has said it is an upgraded version of the C4 and better. It is not. I don't honestly know what to believe anymore but I do believe one thing - Colorful have said that this is an attempt to undermine sales of the C4 in europe and also the CK4 when it becomes officially available. This is between the eBay seller and Colorful.
As I have said before, more control is what is needed. I suppose I can't really blame the guy on eBay, we all need to make a living. Let's just call it a day now, I have learnt a lesson and I have both players now and in the end I can live with the fault, it still works O.K. and actually I do like the way it looks.
Oh, on reflection I'll admit that having paid considerably more for my C4 I felt a little upset to see a much cheaper version, it kind of devalued the C4. Now I know the two players are so different and can't be compared I no longer feel that way and this thread should now be closed.