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davidKSA have been around for over a decade now I believe, so they are not a "fly by night" operation.
Headed by a man named Rick Kressler (hence the K; Kressler Sportscard Authentication). HQ is Kitchener, ON, about an hour SW of Toronto.
Their standards do seem to have become more stern in the past year or so, though their cards don't generate anywhere near the prices of PSA, SGC, et al.