I love my foot with the guide, however, I need to adjust my needle position. Remember that if you find your scant 1/4" for a project, then change anything for the next project, such as fabric or thread weight, you should recheck your needle position as it may need to be changed.
Remember that you don't really measure the seam, you measure the resultant patch.
Here's a good way to check.
http://www.quiltingboard.com/tutoria...ce-t89997.html