I haven't heard of any danger of installing it and you have to do it manually. There still could be a different one on the 17th which you could easily get from Apple. On the 17th all you will have to do is hit check for update with the GM one you have to hold down shift/option + click update then find the .ipsw and open it.
Manually as in holding shift/option + update or restore then finding the ipsw and opening it. On the 17th it will be automatic when you click check for update, but now it will just say you are up to date unless you do what I first said.