I usually wait for the buyer to leave feedback so I know when they have received the item. Maybe a better way would be to ask on the listing for them to notify you using the e-mail or questions option and then leave your feedback first seeing as you have already been paid.
The buyer has always had more security on the deal, they can stop the payment if paying by credit card or Paypal whether they receive the item or not. So long as Paypal only withholds the payment if there is something obviously wrong or misdescribed that's fair enough. I've paid a few times by other means in which I have to totally trust the seller.
Martin