I would give 5 stars if their jerseys looked authentic but they definitely look like cheap jerseys made from China. But I know to stay away from them. I also think you are not always betting against a real human. I think they have a bottom price and if your winning bid is below that it will have a bot outbid you until they hit their target price.
What I am impressed about is their selection, their shipping speed and their customer service. It did take a day or two for them to respond to me on my Brian Urlacher signed photo that had a red streak line on itX but they gave me the option to send back for a refund or to get a partial refund and keep the item.
Overall, I'd rather have this website as an option than it not exist. I've already purchased 6 items off of it within the past few weeks!