I took the Veritas Prep full course with Anthony Ritz. Anthony is a fantastic teacher who focuses on providing added value that the books and online aids cannot. He does a marvelous job going through the why, how, and meaning of each question which is important since GMAT is not an exam where you can just memorize questions or question types. I also had some private tutoring with Anthony and if you need it I suggest signing up with him. He's been a tutor for some time now and knows how to find your problem areas, drill them, and lead you to get more questions right. A serious teacher for a serious exam indeed.