I have had mostly good experiences but plenty of frustrating experiences where the seller brought me the wrong color item. Since that was entirely the point of my trade (to help complete my catalog) it's really frustrating, because it takes a long time to check your catalog to confirm they brought the right color, and then if they didn't, it's a pain to try and work out a solution. I partly blame Nintendo for designing the game so that it would make us want to trade with strangers to get items, but then not designing an adequate trading system to prevent this kind of malarkey. It would have been so much better for everyone if they had designed a trading sytem for us to use. Instead, a game that is super low stress is stressful because of stranger danger, lol.