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Marc S.Grading companies are a tool - but they do have their limitations. We all realize that, I think. Overall - many have criticized all of the grading companies [not just PSA] that have technical merits of grading but do not include things like contrast and image clarity on issues such as N172.
All that said - there are definitely a number of dealers with whom I would feel absolutely comfortable buying a card sight unseen, whether raw or graded. And, on the other end of the spectrum, there are a small handful of dealers with whom I would never buy a card, graded or otherwise, without personally inspecting it or having the opportunity for a 100% refunds.