The idea is great, but the execution has a ways to go. You only seem to be able to run one unit test file, rather than a package or project. v1.3 complains about the @override symbol despite needing 1.6 JRE and @override was added in 1.5. It also does not seem to execute with the correct classpath, as any lib/jar dependencies aren't found if not placed in bin directly. Still, eclipse integration of a mutation testing tool would be nice if it was more flexible.