My opinion of Haggerty is a bit conflicting. On one hand I find his analysis and especially the volatility bands quite useful. On the other hand, when I visited his presentation during the TM 2001 conference, I found it to be extremely disorganized and somewhat confusing. He also has sort of his own terminolgy with funky names such as "Slim Jim" that means nothing more than a consolidation, etc.
It seems that he is more of a reversal kind of guy and I personally prefer trading trends. Also, I like to follow 1 or 2 stocks and it seems to me that he follows a bunch of sectots and stocks at the same time.
Anyway, that's just my 5 cents.
IRAF