I use one as my "carry sharpener".
The set-up ain't bad for "on the go" needs. I've used it with my Falkniven U2, M2 Mini-Ritter Grip, a large S30V Ritter Grip, and a few others.
One difference these sharpeners have is that the ceramic has grooves in it. At first I was worried about that surface texture, but I still get a shaving sharp-plus edge, so I guess it is okay.
Don't pay more than two sawbucks for one is the only caution I have, as I paid less than that and have noticed some sellers really over-pricing the product.