The buy signal I prefer to use, 25-90-9 MACD Histogram crossing the 0 line, gave a BUY signal at the close Friday. I will be buying SPY (or SSO) at the open Monday (1/9/12).
If you have a question or constructive comment to make, I'll be happy to respond. If you want to tell me what a big idiot I am, I won't waste my time on you.
For the record, this signal has only been wrong 2 times out of 17 trades since 1960. The biggest loss was 14.29% in 1973 during a period when Buy & Hold lost 23.35%. This includes dividends.
Bash away.