I don't know that I would trust paypal protection exactly.  I have used it with Ebay in the past, and while the results were in my favor, it was a general pain in the ass.  I do think they tend to err on the side of the customer though.  I had a buddy with a business selling telemarketing data and he had to stop using paypal due to the insane amount of chargebacks that were not found in his favor.  That said, just use a credit card.  If what you buy doesn't arrive or work, Visa and Mastercard are amazing when it comes to fraudulent transactions.