Is rapid economic growth experienced by the East African Community during the past decade built on solid foundations? To gain some clues, we use a variety of newly-collected and existing data sources to analyze the structural transformation of output and exports, as well as indicators of their quality and sophistication. The move from agriculture to a wide range of other sectors--bodes well for continued growth, as do gradual improvements in quality. Yet, no clear winners on the production side seem to have emerged, to embed a durable comparative advantage in international markets. These observations may instill a note of caution against projecting rapid growth into the distant future.