Recently I have been noticing that the color pay-off has not been the same between the old MAC shadows and the newer MAC shadows. I have not officially heard anything released by MAC stating such, but I believe the proof is in the pudding.
Below you will see unedited photo two swatches. Both swatches were swiped a total of four-times each. No, they are not different colors. They are MAC's "Plum Dressing" eyeshadow. The swatch to the left came from a pan purchased in '05 or '06, whereas the pan on the right was purchased a few months ago.
That is an extremely noticable difference in color pay-off, even to the untrained artist-eye! I have found the new formulas to be not as easily blendable and lack the "wow" factor for which MAC has built a reputation on. Needless to say, I found this to be very disappointing and I can not help but feel somewhat cheated. Being a MAC customer for years, I have come to expect a certain unparalelled quality in their cosmetic products... Guess their downfall is where other cosmetic companies begin their rise. ;)