I’m currently using the Schweser package exclusively. I bought the one the SchweserNotes (5 books covering the curriculum and one practice exam book=3 exams and formula sheet), and then the second volume of practice exams for 3 more, and the financial calculator book. I shouldn’t have bought the latter as turns out I already knew 90% of the stuff covered, but it’s still a nice reference to have if you can afford it. As for Qbank (I think they call it SchweserPro), I’ve played around on my buddies copy who’s doing it in June, and it seems like it’ll be a go-to during the last month or so, but its pretty pricey as well.
Also, if you have an iPad get the Schweser app. It only covers ethics/conduct, but it has all their videos for those LOS’s, which are indespensible, considering the app is free!
All that said, from what I gather it seems like studying from SchweserNotes/exams/Qbank is the ideal technique, then using the CFAI material when you need more coverage. And I’ve heard that you might want to read the crap out of the CFAI ethics book too though, just for thoroughness.