To all here who withold feedback until after the buyer posts theirs ("You first, NO, YOU first"), don't you think that if a buyer sees your positive feedback after payment that it tends to put them in a better (i.e. more positive) frame of mind when they do actually receive your item? Something like a pre-emptive goodwill gesture? I figure if someone is hellbent to neg me, they're going to do so anyway, and even if I've already posted positive and can no longer neg them in retaliation, I can still follow-up my original comments with a more pointed 'final word' on the transaction. Doesn't that accomplish much the same thing from the perspective of anyone reading and evaluating their feedback? I certainly give those follow-ups added weight
Something like this happened awhile back with a 4 DVD order that arrived opened with 1 DVD missing (yep, horror movies...grrrrr). Anyway, this little creep e-mailed me about the missing DVD, and within 22 minutes, before I could even read much less answer his e-mail and reassure him I would replace or refund the missing item, he vilified me with ALL CAPS negs on ALL FOUR ITEMS...even the 3 he received in great condition! So I posted scathing "give your head a shake" style follow-ups on all 4 items, and since he had only like a 14 rating after a year or more, I knew those comments would be seen for quite awhile. I put my faith in the general intelligence of the general eBay buyer/seller population for seeing through such nonsense.
Sure, I resented his unhinged and completely unwarranted negs, but heck, they dropped me...what...from 99.7% to 99.6% overall positive...and they read so wildly out of character with all the positive comments surrounding them...well...who could possibly take such raving screed seriously? Moreover, I think it backfired--he just made himself look very petty and foolish instead, and everyone posting positives immediately afterwards were even warmer and more supportive than usual. So did this mean I was supposed to begin treating everyone with extreme wariness based on the possibility that this kind of random flakiness could re-occur? No way...if I ever become that jaundiced and adversarial toward the majority of good buyers and decent people on eBay, I'll just quietly cash out, and go do something else. I don't want to feel like that every day.
Negs...we're going to get them...the longer we're here, the more those odds increase. As already suggested, it's best to just get over them as quickly as possible, and move on.