When ending a MarketPlace listing successfully, Pinsiders can invite user feedback from the other party. Marketplace feedback cannot be removed, but can be responded to by 6S3NC3.
New! It is now possible for any Pinsider to leave feedback, without an invite. There are some checks in place to avoid abuse and "fake" feedback.
“Mike purchased my MMR and the transaction could not have gone smoother. Absolute stand up guy, would be glad to deal with him again anytime. Thanks, Frank”