I tend only to use a straight on an evening or non work day, then do a clean up pass with an Ever Ready SE as there are odd hairs which lie flat and in the wrong direction to be physically able to an ATG pass with a str8.
I've been told that if I used a straight exclusively (without a SE or DE clean up pass) it would effectively train the growth direction over time and I'd result in getting better str8 shaves in the end.
So what's your thoughts, is that right, partly right or total hogwash?