We expect that the use of microarrays will continue to grow over the next few years and that they will be a mainstay in genome-wide diagnostics for some time. Our study represents a comprehensive assessment of the capabilities of current technologies for research and diagnostic use. By making these data sets available to the research community, we anticipate that they will be a valuable resource for further analyses and development of CNV calling algorithms and as test data for comparison with additional current and future platforms.