It works for me. For those who understand how it works, it can be a very good tool. My window for it started last Wednesday and generally runs into the Tuesday of expiration week. Normally if we are above it and in a strong uptrend, we'll get to within 0.50 on the QQQ and reverse back up and away. We did that the past couple months. After that, there's usually a dump beginning either the Friday of expiration and going into the early part of the following week.