I have it and attended about half the lectures for REG and none for BEC, passing both. I am studying for AUD now and have not attended any of the live lectures. The live lectures are fine, IF you have a good instructor. I was hit or miss after sitting through 6-7 classes total. The ones in which I had good instruction were fantastic. I learned a ton and felt better than I would have just studying myself. But when you have someone simply reading to you from the textbook for hours and hours, that's pretty disheartening. I jumped off a couple of class sessions simply because that's all we were doing.
If you are looking for a real motivator, go ahead and pay your exam fees and schedule the test, 5-6 weeks out. Leave yourself only 2 weeks to get all the way through the book or course, then 3-4 weeks to review and do a bunch of MCQ. Having that exam on the calendar with the clock ticking is a much better way to stay on track than any particular mode of study.
I think most of the value for Becker is in the book. It works like magic for me; I had the Roger course for FAR and admittedly passed it, but the book was massive and very difficult to concentrate on for any amount of time. I had to rely on his lectures a lot more because I couldn't use the book as effectively. The Becker book for all sections is about 1/3 the size of Roger or Wiley, get explains the important items in more clear, concise language. Anything I can't understand from reading the book, I'll view the National lecture to help. For what it's worth, I think the Becker course (even just the online version without live online classes) is the cadillac of CPA Prep. You'll find just as many that say Roger, but I thought his lectures were way too long and the book was marginal at best. The key is to find something that works for you.
And go ahead and schedule the exam.