TBD...so many variables when you are actually shooting on match day...but in practicing on range and with the DFAT the DFAT system is the close as you are going to get in your home.So far, does the dfat seem worth it?
I am cross-eye dominate, and I do notice that putting the DFAT on my scope does cause me personally a little strain after 5 or 10 minutes of going on and off scope.