AS A BUYER, I will always send funds as quickly as possible. But in return, I expect the seller to leave feedback immediately, because as the buyer, my part of our purchase contract is fulfilled.
IMPORTANT: If I am buying something from you, I will require you to leave feedback for me BEFORE I leave feedback for you. If you are a seller and do not approve of my policy, then do not do business with me. Since I fulfilled my part of our purchase contract FIRST, then I excpect feedback from you FIRST. This is only fair, and it's the only way I do business on eBay.
AS A SELLER, I will leave POSITIVE feedback for you the minute you pay me. I believe it is morally and ethically and contractually unreasonable for a seller to hold a buyer hostage until positive feedback is received. After all, you've trusted me with your money.