WSKTS Press Reviews
The Guided Field Sharpener 2.2.1 gets reviewed by Field & Stream magazine.
"The key to the WSGFS is the 20-degree guides at either end of the tool. Unless you’re an expert at sharpening, you’ll find it’s almost impossible to hold a knife at the same angle for each sharpening stroke, and you end up removing steel from the blade instead of getting an edge. The guides solve this."