My Mother used to use it, not much, but some, and that was close to 50 years ago.
I've not used it since. I just remember stuff made with it having an odd flavor.
Well, I will occasionally buy a bottle of Bisquick pancake mix, those little yellow bottles. I don't know if those are the same stuff as in the box or not. But, kind of hard to actually taste the pancakes when they're resting under covering of butter, maple syrup, over easy eggs, and sausage or ham.