I am because it helps with my retention, but I definitely don’t use FA like my bible. Of course I’m still a ways out from step so I will probably use it more as it gets closer.
I look over it along with lecture/zanki. If there's a concept that I know I'll struggle with later on, I try and put helpful stuff down for future me. A lot of M2s recommended that I start now (early M1) because as they're going through FA they wish they had annotated as they were learning.