Lindq, I am not familar with CCI - what does that refer to? Buying on extreme fear is an acquired taste - I enjoy it myself but standing up against a speeding train has often proved to be very painful.
currencies are a very different game. not biased by greed and fear in the long run towards one direction. ES is very different IMO.
CCI is commodity Channel Index, an indicator that is available with most trading software. It can often be useful as a divergent signal. For example, when it diverges from Stochastic. As I said, I don't use it for my primary system in normal market conditions, but when the market gets very weak, I will often use it as an additional indicator to help me select the best possible trades. If for example you have a pullback system, try adding the requirement for a rising CCI for a couple days leading up to two days prior to the trade. You may find that it enhances results, although it will seriously cut back on the number of trade signals. However, in an extreme market pullback that isn't a bad thing, and that's how I put it to use. I also use a divergent CCI in a short swing system I trade that's quite successful, but of course in the opposite direction as a pullback. There I am looking for CCI to diverge downward while price is still rising.