Ranked in these QuestionsQuestion Ranking
Pro Ability to run tests on real devices
Simulating or emulating tests is good - actually testing on real hardware is better as you'll catch device (manufacturer) specific issues that would kill your app ratings in the wild.
Pro Good customer support
Pro Easy setup
There's no configuration files to write, nothing to download or install, nothing to really configure. Setting it up takes basically only adding your Git repository and waiting for the clone, build and test to finish.
Pro Automatically builds, tests and deploys apps
Pro Many useful integrations
Simplifies the instant access to the latest state of your apps.