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JasonScott KSA is a Canadian grading outfit that does over grade cards. I have had a few in my collection in the past. Of the three I crossed to SGC. 2 of them were 2 grades lower and one crossed at equal grade.
As far as KSA goes I think it is fair to say they wouldn't slab a counterfeit, but I wouldn't bid on high grade KSA and I would always bid about two grades lower then what they say.
As for the other graders. I don't think I would buy a high grade GAI ever. Lower grade ones I would take a shot at. I've had success crossing a few to SGC.