I used Schweser almost exclusively for LIII and passed. The notes are great, and cover realistically about 100% of what you need to know to pass, that said CFAI material will have some additional material that may or may not show up on the exam. I started reading both the Schweser notes and the CFAI material, and I found the CFAI material to cover the same stuff, though was much lengthier and more difficult to get through and I stopped going through the CFAI books. The QBank is just OK. I used it mainly to drill down the main points and to make sure I had the formulas down. One thing the CFAI books are excellent for are the end of session questions which you should do for each study session. Pretty much everyone will tell you though that practice exams are the best way to really prep for the exam. As you do practice exams your weaknesses will come out, and that is where the Qbank can come in handy and you can drill through dozens or even hundreds of questions on a particular topic to get up to speed.