Review (4/5): Great for clean lines on the face, not so great for the neck
This product is really great for shaping your beard on the face. It's easy to line up and get a very clean beard line on your cheeks. Switching to the other side also allows a nice even looking beard.
It's not so great on the the neck. I tried holding the shaper in every possible way on both sides of my neck and I could not find a line that liked for my neck. It ended up being easier and neater to just follow my existing beard line on the neck.