I recently read a person's account of her first quilting classes, and she said the teacher measured all their seam allowances and if it was not a precise 1/4" they ripped it out and re-did.

I understand the feet on any given machine may be off by 1/8" or so, but as long as you are consistant with ALL your seams, making sure they are the same, does making it 1/4" REALLY matter that much?

I honestly don't know if my foot I normally use is a precise 1/4", I never gave it much thought before.