Does anyone have a "Veff Sharp" Field Sharpener?

[d2eux]

Any thoughts on this one?
http://www.crkt.com/Veff-Sharp-600-Diamond-Grit-Stepped-Knife-Sharpener

It specifies sharpening for serrations, but I'm not sure if it would work with other knives too like straight edged fixed blades

 

[GallantEdge]

Unless you need extreme portability, I don't see much benefit there. You can find other portable options. YMMV though.

 

[orthogonal1]

Looks interesting.

Seems to be a viable tool for use with "teeth".

The video is good, BTW.