I started using ebay approximately 10 years ago as a buyer. Then as a seller. It's a good website... I've got many good deals, few bad deals because I'm really picky 'trusting' my seller.
You need to do some research 'from whom' you're going to buy your item. If they have zero feedbacks and no history at all. It's kinda risky to buy from that person. I like reading the seller ME page. And see what they say about themselves.
Just be very careful and know when to stop bidding. Coz otherwise instead of saving money. U'll end up losing money. ALSO. Know the 'retail price' first before thinking an item is CHEAP. Coz with all those bid war. People forget that the item end up cheaper if you just go to the store and buy it there, they get caught up with the 'bidding war' and want to win the item so bad w/out thinking that the price starting to pass the 'retail price'..