Actually, last May was quite different as my long-term model was SHORT (as I posted above).
Today, both the daily and long-term model are LONG. In fact, the LT model has been long since 1270 on August 1 (almost 200 points ago).
My daily SP-mini futures model has been LONG since 11/3/06 (1364) with brief SHORT trades along the way (12/14-12/21 and 1/25-1/31).
I really don't see much weakness going out a couple weeks. However, I do run this daily and will note changes.
Longer term - I haven't had a LT short since...
I agree that they do not, and primarily because most indicators are somewhat subjective. Even hard-and-fast rules are often overruled by the trader - emotions, gut, etc. and day-trading increases the occurences of this happening.
My philosophy is that more trading leads to more mistakes.