So like everyone else, I moved to Android Studio and encountered issues.
My current issue - Android Studio won't let me run an application without a launch-able activity in the Manifest, for example, my application Pro key which isn't suppose to be launch-able and runs great with Eclipse.
Obviously it's not suppose to run but is there any way to install it directly from Studio?
In Run/Debug Configurations (just next to the launch button in the toolbar) you can manage your application configurations. There you should be able to specify whether you want to launch an Activity or not.