We hear a lot about horrible ebay situations in this thread, so when I have an outstranding ebay experience I want to tell people about it.
I bought a non-pony item from an ebay seller named addjunkie2. She sells vintage clothes and toys and sewing items. I got the package in the mail promptly, but it was the wrong item. When I messaged her about it, she immediately responded with an apology and sent out the correct item that same day, and I received it two days later.
She told me to keep the wrong item to make up for the mistake.
Great communication and stepping up to correct her own mistake without making any additional inconvenience to the buyer. If anyone out there is looking for some vintage items, I heartily recommend this ebay seller's auctions!