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Hi @perambulator, no such thing as a stupid question at all!
I did my CFA exams quite a few years back, but also used Schweser exclusively. Main reason for me was the sheer length of the materials in CFAI books, and it was just too much and ‘wordy’ for me to go through whilst working in banking (long hours). At that time, I did some research and Schweser seemed to be one of the well rated study material provider that came highly recommended. So for me it was about saving time really. CFAI materials are pretty good, just lengthy for some.