Yes, they are legit. One of several websites used by professional auctioneers to give online exposure to the items they are selling. Some auctions may be online only, and others may be simulcast (online bidding combined with a live, called auction). Just be sure to read the terms carefully. They usually have a buyer's premium (normally 15 to 25%) added to the final price, and may charge sales tax and a convenience fee to use a credit card. Also, be sure to know how shipping is handled, or if it is even offered. Just this afternoon I was the winning bidder on a Benjamin 237 pump pistol for $45.00, plus 15% BP in an online-only auction hosted by Proxibid. Going to pick it up locally tomorrow, as this particular auction did not offer shipping. I also happen to be a licensed auctioneer, but work primarily with firms that only do live, on-site auctions with live bidders.