[saucetenuto]

I have the same problem as the GP, on four monitors. All four, bought at different times in different countries, are miscalibrated according to these calibration images. Is that plausible? If not, what might be going on?

And if it _is_ plausible that four random monitors are all miscalibrated in the same way, why should we optimize for well-calibrated monitors?

[johnnovak]

If you read the article carefully, you'll realise that this is not just an optimisation (check for example the sections on colour blending and rendering; those artifacts are gamma calibration independent.)