This recently happened to me and I appreciate that the seller can't leave retaliatory feedback anymore. I bought a t-shirt for a chrissy present in early Nov, paid immediately after winning, then failed to hear from the seller for over 3 weeks. I sent many emails before finally putting a dispute in. The very day after the dispute is lodged, the seller emails me saying he sent it weeks ago and I should have received it by now. I ask for a shipping date, which he doesn't reply to, and then I get the T-shirt 5 days later postmarked the day AFTER the dispute was lodged. I leave him neutral feedback and he retaliates by not only leaving me negative feedback but sends me an abusive email saying he is thinking of suing me for libel (WTF?). I point out that everything I said in my feedback was true and I have emails and the postmarked package to prove it. He never replied to me, and ebay would not assist me in resolving the negative feedback he left me. A black mark on my record because the seller was dodgy as all hell.

So now I don't use ebay anymore.