I have Galaxy S3 running on Jelly Bean 4.1.1. I noticed that haptic feedback differs for each of the soft keys. I can say that menu button vibration is more intense than back button. Additionally keyboard strokes is weaker compared to soft keys (menu and back button). It is understandable that keyboard vibration is lower but I would prefer same intensity for both of the soft keys. I wonder if this is same with all users.