If you are in the market for Game Used or New player memorabilia and the auction offer Quick Opinion from PSA/DNA, it is worth paying the $10 to make sure that you are getting authentic items. Most sellers that do not offer any kind of link to Quick Opinion or other service then it can be that either they do not know or do not want you to know. I am new to Memorabilia but all my items are given to me by Former NBA star Kermit Washington who works for the NBPA (National Basketball Player's Association) and I am authorized to use the NBPA logo on all my auctions. You cannot get more legit than that which is why i am one that offers direct link within my auctions to the PSA/ DNA Quick Opinion.