There were about 20 POTN members (that we know of) among the crowd of around 350 people at the Oak Brook (Chicago) seminar on March 30.
His target audience is the advanced amateur or part-time pro interested in photographing people (wedding, seniors, studio, PJ, etc.). If you just bought your first "real" camera and still coming to grips with shutter speed, f/ stops and white balance and what they all mean, then much of it will probably overwhelm you but you will also get a feel for the thought process required to think about light and make truly great pictures. Conversely, if you're a seasoned full-time pro, then much of it will bore you but you'll still take away enough ideas and inspiration to make it worth your while.
He promoted the Westcott Spiderlites quite a bit, and extolled the virtues of continous light. This method certainly fits well with his digital calibration targets which he also promoted. The seasoned vets certainly understand the pros and cons, but I feel he glossed over the limitations of continuous light (vs. strobes) that the novice shooters may not fully comprehend.
Aside from the live seminar and various stuff for sale, if all you do with your $19 ticket is walk in, get your free 4-hour DVD set, then sign up for the $35 PhotoVision subscription and walk out, it will be the best $54 you ever spent.