i never had a problem with anyone on ebay yet, i usually buy car stuff, tools, and some collectible items.
If i was buying something from someone. I would wait until i got the item then leave a negative feedback. Ebay suggests 3 days maxiumum of communication between buyer and seller after the bid.
I usually email the person saying heres my address and how much is the total, and telling them how long its gonna take me to send my moneyorder. They reply back with their info. I send the moneyorder, and usually inform them that i did. Some sellers reply back that they got it and they are sending the item.
The longest i had to wait for an item was less then 10 days.
You dont want to piss off anyone, because they can keep your money. There are people who can switch info and get a different account on ebay.