Frank,
I look just down the left side of the string (Left as you are at full draw)......I can just get the blurry edge of the string in my vision and can still brush my nose with the string.
By looking down the edge of your string your pins will be skewed just a bit to the left to compensate for the slight off angle.
But now with both eyes open your field of view is perfect. Just a clear pin and the animal.

I really liked it when I was using it, and I think I'm going back for a hunting bow. After a while you don't even think about it, you just see that dot/ring in your peripheral vision.
If you can get the unit close enough to your pins, you can take in the whole picture instantly.
It's a pretty quick aiming system.