Blazers work great with an offset, that is what I am currently using right now. And they work just as well or better with a helical. What you have to remember is the blazers have a higher profile and are much stiffer than the your normal 5 inch vane so they control better. As far as control goes I like my blazers just as well as feathers. Not very forgiving though because of how stiff they are.

In my opinion putting blazers on with a straight fletch is a waste though.

Paul