I've been doing business on ebay as both a buyer and seller, since about 1996, and have never been screwed on a deal.
In my long eBay history, I have built up an official deal count of over 1000, but it would be closer to 2000, since only about half have left feedback. Most are as a buyer.
In that mix, I sold one car, one tractor, one tow-behind digger, several chainsaws, etc. Bought one car, some tractor implements, chainsaws, etc. I buy something about 2-4x/mo.
Of that total, I had a guy send me some broken tool, which resulted in me giving him neg F/B, back when a seller could do that. I have had to go thru Paypal for a refund once. I shipped something that the USPS damaged. In that case, I gave the buyer a partial refund, and claimed my $50 damage from the USPS.
Overall, very very few problems in 2000 deals. Happy.