Having read up about this, would it be clear to say that the screen fading from top to bottom is a general characteristic of the TN displays in the imac? And not a general fault with the 20" as many users seem to be "representing" the situation as being. Ive been using a laptop which ovs has a TN display and just recently noticed a slight fade effect, and tbh hasent bothered me much. Is this similar to the imac 20" or more noticed? It seems that many have just calibrated the hardware display and this situation is now non existant, whereas with others still notice "effect" on their monitor which leads me to believe some could be faulty? Dont get me wrong the 24" is lovely, and as much as i would live to buy it, its just a lil too big for me. To summarize: 20" TN display characteristic or/and a fault with some imacs? Thanks.