sharpening jig for planer knives

Has anyone ever used this jig to sharpen planer knives?  Looks simple.

**The New Mini-Me**

Deulen Sharpening Jig

Sharpens 2-5/8” to 3-1/4” Electric Hand Planer knives

I haven’t but it seems to get pretty good reviews and is a logical design using the “scary sharp” principles…price seems a tad high for a single purpose jig but I might get one anyway.