what winds me up is if someone buys something off me and they pay instantly then I leave their feedback there and then.
It seems more and more the case (the last 10-15 purchases bar 1) I have to chase the seller for my feedback
It's almost like they are waiting for my feedback about them before they decide what I'm going to get even though my side of the deal was flawless.
If you are the seller though you can't leave neg about them. when I did my last sale all I had was later or positive.