I do not leave feedback for sellers until the plants arrive in my climate that is May. One time plants from one seller did not arrive when they were suppose to. After giving him extra time I sent a email asking about the plants, he started checking turned out he used my address but the wrong state he corrected the problem. When the problem was resolved and the plants arrived I left positive feedback stating that a shipping problem was quickly resolved. I do ask sellers to leave feedback for me when they get my payment so I know it arrived.
Adding that there are some sellers that don't leave feedback and sell very nice plants I have purchased from the LA since 2001 seems like more are leaving feedback these days or else I am not buying from those that don't.