RoboGuice smoothes out some of the wrinkles in your Android development experience and makes things simple and fun. Do you always forget to check for null when you getIntent().getExtras()? RoboGuice is on it. Think casting findViewById() to a TextView shouldn’t be necessary? RoboGuice is on it.
RoboGuice takes the guesswork out of development. No longer do you have to remember that you get a user Service using bindService() but a system service using using getSystemService(). Inject your View, Service, or any other object, and let RoboGuice take care of the details.