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runscottGAI seems to be tougher than SGC and PSA at times, but this may be an illusion caused by their "half grades",e.g: a card is closer to a 2.5 than a 3.0, but closer to a 3.0 than a 2.0 - SGC and PSA give it a 3 and GAI gives it a 2.5.
I also agree with Kevin's assessment of GAI's "odds and ends" grading.