BoyRacer, your update did not install. The current version MBA41.0077.B0F was the previous version we were all running on. For a short time yesterday after the update was released, Apple's firmware page was updated to reflect MBA41.0077.B11F as being the current version - they have since, having realized this was a bad/erroneous update, canceled the software update & revised that page to show MBA41.0077B0F as being the current version.
From everything I'm reading, it's pretty apparent that the new EFI didn't actually install for anyone.
My install took a very long time to restart after reboot. Thought it was bricked. Was in process of researching the issue on the iPad when it finally rebooted. My points of note:
1) Definitely starts from sleep more rapidly now. Love this.
2) Having issues with wi-fi now. Specifically, after waking the computer from sleep, nearly every single time the wifi network is no longer chosen and active. I have to wait for it to scan for available networks, and select correct one to join. Annoying.
Mine still shows the old version number, but my fan used to sound like a jet engine most of the time and doesn't anymore (in fact I don't think that I have heard it since), and I am experiencing the same wifi issue that Gav is experiencing. I think it is partially installing for people who tried.