I love Doctors In Training. My experience thus far (I'm almost halfway into it) has been excellent. It has given me the structure I desire, and is preparing me well for the exam. I am doing the online version, and at $550 I think it's a bargain.
With that said, everyone is different - but I can't imagine that most people won't find it helpful. And it's hard to argue with his results (the average Step 1 score of his students is 236).