Before eBay's feedback policy changed in March of 2008, I had a 100% positive rating of almost 1300. By extension, I've never left a single negative for any seller I've had dealing with. I thank them all for the great and conscientious service I've received here over the years.
Payment policy
I always send money promptly via PayPal, often within the first 24 hours, but sometimes immediately upon auction end.