My wife and I got our SGS4's Friday and we are still finding features and teaching each other things we're stumbling into. This phone has truly made me RTFM, and I'm actually not mad about it
Samsung Galaxy S® 4 MJA Rooted with CF Auto-Root Tutorial
HTC EVO Design 4G™ v4.0.3 Bootloader Unlocked & Rooted with HTC SuperTool v3
If it ain't broke, use a sledge hammer.