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T206Collector...one is that my T206 "A.O. Jordan" was mislabeled "Tim Jordan, Batting" -- a fairly understandable mistake that SGC will fix for me I am sure.
The other is that I am sometimes concerned that their little black inserts fit too snugly on the card and can leave impressions in the edges of cards. I have one or two cards that I think I can identify where the inserts left an impression on the cards. It didn't change the overall grade, because we were at 60 and under, here, but it was somewhat disappointing nonetheless. (And in one instance they fixed the insert to make it fit a little bit better.)
Otherwise, I've got about 250-75 SGC graded cards and no other complaints to report.