HGA is revolutionizing the grading scene! They use computers to grade the cards primarily taking out the Human Element, Emotion and Error!! So your grade is true. They are very tough grades so I've found a solid grade up with both PSA and Beckett...example a HGA 9 MINT would likely come back as a PSA 10 or a BGS 9.5+. 

Check out my other listings and ask for combined shipping!