The document summarizes the long-term performance of the Terra and Aqua MODIS instruments. It finds that both instruments have successfully operated for over 9 years, with Terra at 11 years. Key findings include that instrument temperatures have steadily increased but remain stable, on-board calibrators continue to function well, and radiometric, spectral, and spatial performance remains stable, though some degradation occurs over time. Challenges include large changes in visible band responses and solar diffuser degradation.