If you're buying and completing a no-nonsense transaction with a business and not an individual then by all means use PayPal. If you're selling however, caveat emptor!
I recently sold a wedding dress (final sale) to the mother of the bride for $2800. Unfortunately for me, this woman was as batty as they come and after purchasing, receiving and trying on the dress, the bride changed her mind. Change of heart is not a valid reason for a return as per PayPal's own rules. Despite this and going though every appeal level at PayPal, this batsh! T crazy old woman just kept changing her story to PayPal until she had one that stuck; and returned a soiled dress back to me. PayPal is one of the worst services out there if you need to go beyond a normal transaction. Stay away and in situations similar to mine, insist on a certified cheque. Lousy customer service and lousy employees and supervisors.