Oddly, it has no index. In the latter instance, the interest would be mainly in basic information and bibliography. If I am correct in the foregoing assumption, those who are looking for specific resources need, first and foremost, to feel confident that the quality of the material they will find is good. They also need to know what is in Perseus so they don't waste time looking for materials that aren't included. In terms of text, these scholars will be pleased, perhaps delighted.
Archaeological data are another matter.
Approaching Perseus in the guise of one using it as a resource for images, I found it difficult to use because I did not know what to expect. Though I thought the architecture and sites coverage was reasonably complete, only two coin collections are included, almost no examples of vases of the earlier periods are included, and there are no terracotta or small-scale pieces of sculpture. In addition, important and diagnostic pieces may or may not be there. Quality of images is another problem. Photographs and drawings are included, as well as maps.