I did try some IM questions from the book at borders and feel that although its a good practice and will supplement your study with FIRST AID well..it is really not very representative of the actual exam. THe Q bank closest to the actual exam is Usmle world. In my opinion if you have done UW questions and still feel he need to do more questions, then it wouldnt be a bad purchase..but if you wish to just use the 1000 questions from FA then i wouldnt advise it.
good luck