perfect here. each time someone completes a transaction with someone they could leave feedback in the others profile that would stay permanently. Sure, there may be people out there that go and leave negative feedback against someone for the smallest thing like maybe their parts were delivered a day later than they expected so they go slam the seller with negative feeback... but for the most part if you are an honest seller, most people will leave you positive feedback and give a good overall picture of what kind of person you are when selling parts online.