My references can be found at www.beckett.com/userpages/imok513.html and I have a positive 385+ feedback on eBay (ID - imok513). I am also a member of Trader Retreat with over 100 feedbacks.
As one of my fellow collector's says, "I will not trade at "eBay values", unless a card is so rare that it is unlisted. For whatever else you may think of Beckett and its effect on the trading card industry, I believe that it is the only objective standard available. If our cards are of the same Beckett BV, I will not trade in your favor simply because you think your card is "under rated", or "sells well on eBay."