I've had the Samsung Galaxy S III for seven days, and so far, things are going well.  The added features on top of stock Android are very nice, and make it easier to get things done.  I'm a big fan of the included battery percentage indicator, tap-to-top functionality, and the customizable lock screen, just to name a few.  Battery life has been impressive as well; 16 hours of moderate to heavy use before it died.  Stay tuned for more!