Wow... I was about to install this update, but all of these comments have me skeptical.
I have an issue with my airport express that forces me to unplug it and plug it back in once every 2 days. It's effing annoying. Was hoping this update addressed that.
The complaints are aimed at AirPort Utility and not the firmware per se. You can update the firmware only and update to AirPort Utility 5.6 instead of AirPort Utility 6.