if you're only trading by watching BitcoinWisdom and others, I see things happen as much as 18s ahead of you.
So if you are not trading looking at the undocumented API you are beign ripped off by those who do. Very nice feauture!
Bitcoinity have started using the stream since I made that post.
BitcoinWisdom are at least aware of it, perhaps even using it by now. Clark's rtbtc has used it for a while. The Reddit post has partly solved the lack of documentation of the stream; the bigger issue here is the sniping window. It seems it's being
actively exploited now too.