I know flat panel afficinados often consider the first 100 hours of "on" time as a break in period. I believe this started with early panels of the plasma variety. The need for this has decreased with LCD and LED panels. Some people still feel a break in period is necessary to mellow the pixels and possibly prevent some of the image retention issues. Many people feel this should be done before color calibration. In the past I have used a continuous loop "break in" DVD with my Plasma TVs. What are your thoughts about doing this with the iMac screen?