I never miter either - it looks harder to do than regular borders and in reading the instructions, it does sound more troublesome. Regular borders works for me (so far).
I've mitered the borders. It depends on the fabric, how much fabric I have, and if I'm in the mood to do it. I should probably try to do it more often, because to me it looks better.
Sometimes I miter and sometimes I don't...depending
upon my mood and luck at trying to do it!
What does your friend mean that it wastes material???!!!
:?: