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Josh K.I cross all my cards to sgc and have done it both ways. I generally will send a card in the slab if I think it will cross at the same grade or a lower grade. Cards that I believe have the potential to jump, I usually crack out. That being said, I have sent cards in both psa and gai slabs that have been bumped up a half to a full grade by sgc (though I wouldnt expect it) and Ive had a few that have dropped (if I didnt put a minimum grade on it). The vast majority have crossed to an equivilent grade. I think you are most likely to get a down grade on half grades that sgc doesnt have a corresponding grade for (ie gai 3.5 - can only go to an sgc 3 or 4) or cards with wrinkles (Ive had psa 4s with small wrinkles that sgc will not cross at the same grade).