I've always been wary of cracking cards over a few hundred dollars. I know others are braver and with good success, but I don't submit often and the more recent perceived tighter standards with PSA were good reasons not to.
My rule of thumb is to submit cards for Review that have clearly been done an injustice. With that high standard, I've had some good success.
For example, the Jordan below. It was just too well-centered and reasonably tight to be a 7. I was beyond pleased when they blew by my 7.5 minimum grade and took it to a deserved straight 8, and in a new holder (at the time)
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