Testdroid takes security seriously. The service is SSL encrypted and all uploaded content as well as all test results are visible only to their owner. All devices in Testdroid Cloud are real physical Android devices where all user data and all non-system applications are erased after each test run and SD-cards are formatted. The devices are also rebooted before each test run. All this is carried out automatically to ensure that there is no test data visible from one user to another and that each test run is executed on exactly identical environment.
All devices are standard, non-rooted devices, just like your users' devices in the field are.