i just had the CD questions...they were good. tougher than both q-bank and the real test, with a different format. but, if you can learn the material on them, it is quite helpful. nowhere near as good as q-bank, but a decent source of questions.
I think the BBS is the best, most comprehensive and detailed step 1 review. If you have time and stamina you should do them twice learning the explanations. I just wish there was a similar review for step 2 I'm using Swanson's, and Brochert's Platinum Vignettes, but don't feel as prepared as for step 1. Good Luck!
tough, tough, tough...classic Goljan questions (I see a few repeats on Pathology tests every once in a while).
I would be a little wary of the dated quality of these questions (pub. 1997) but the science is still good. Some of the really new science may not be up-to-date. Overall, the hardest, most comprehensive review available. A great interface also.
btw, the book questions and the CD questions are identical.