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 Multiple integrations to cover your needs
Simplifies the instant access to the latest state of your apps.
Pro Easy to 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 Focused on mobile app development
It's dedicated to mobile platforms and supports Andorid, iOS native apps + a couple of cross-platform frameworks such as Cordova and Ionic.