I have friends taking the live Kaplan course, and according to them, it consists of questions that have not been updated in quite some time. I've stopped doing them, because the Kaplan people told them to concentrate on q bank (it's a good thing--I wasn't doing too well with those q book questions)!
From what I've heard, qbank is a very good indication of the types of questions you'll see on Step 1.
Ive done a couple hundred questions in Q book. All I can say is that it is a good break from computer eye strain. The actual questions are similar in length and format to Q-bank, not exactly the same but similar. Same ****, different resource. If anything, they will reinforce concepts, especially if you are bombing certain subjects in Q bank. You can take the questions by subject in Q-book without screwing up the randomization scheme or whatever you have for Q-bank.