I had also heard good things about these books..I picked them up super cheap from Amazon, but have yet to work thru any of them. I would agree that they may be good for hammering home facts/helping improve recall ability, but I'm not sure about beyond that. The questions aren't in vignette format and don't appear to require multiple points of insight like world questions. I may still give them a shot at some point, but I'd be interested in hearing any other experiences also.