You only have sixty days to leave feedback on eBay. That is enough time to ascertain whether a plant is healthy, pest free, and matches what was in the photos. It is not enough time to determine whether the plant is the right variety, at least if the only way to judge is by its fruit. What those eBay feedbacks say is that GuavaKing sent customers a healthy mango, guava, or sapodilla of some kind, though not necessarily a Chaunsa, Mexican Cream, or Butterscotch. He very well could be selling grafted or mature cutting-grown plants from some of the rarest, most desirable varieties of mangos, guavas, and sapodillas. There is evidence that, in the past, on many occasions, he has not done so and has gotten away with not doing so. Weigh those facts and make your own decision about whether to purchase anything from GuavaKing. But, on this issue, I believe one should keep at the fore of one's mind caveat emptor.