I would like to disagree with you on that one! not that i am happy to do so though
I got two 32GB versions direct from Apple and both suffer massively with the signal and yellow blotch issue! i can sit here with it on the arm of the chair with full signal strength then all i have to do is touch the left hand side and bridge the two metal strips and within 30 seconds the signal has gone! move my finger away and it comes straight back!
All i can say is there must be a bad batch with some kind of conductor or insulator missing and you have been lucky to get the good ones!! i am certainly not a hater by any stretch of the imagination!! why would i shell out £1200 too slag the thing off