what is the seller's exact feedback? if it is greater than 30 then you should be pretty safe and should just wait on it. i would just wait and when you do get it leave positive feedback but mention how long it took.

ps ebay rules state that the seller has 30 days to send the item if it is not stated earlier in the auction. i usually try to state "will ship 2-3 days after payment is received" and buy from people like that.