I'm signed up to take it (Electrical Power). Starts this week. Here's my $.02...
I'm honestly not expecting much. I don't expect it to be a full prep for the exam. I'm still planning on taking the Testmasters course in September/October. But signing up for this course gets me started with a structure in late July. I've already gone through the sample exam twice, but I need more problem solving, more problems, and more work. I really signed up for the PPI stuff to help force me to work the next 6 weeks before the Testmasters course kicks in.
I think I'll do better with an in-person course, rather than a "guided self-study" course like PPI is offering. They do have sample problems, which I want to look at, and is a big reason I signed up (though from what I've read, some of the sample problems are of marginal value).
I guess it boils down to, I'm taking the course, but I don't have all of my faith put in the Passing Zone that I would actually "pass" the exam. It was cheap enough to me (use a coupon!) to say what the heck, and take it anyway.