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i have one but find it doesnt work on certain knifes. if the blade goes to the handle evenly you wont be able to sharpen the whole knife and if the blade is too thick like my gut hook skinning knife it wont fit in. they are designed for kitchen knifes so keep that in mind. it does do a great job though on my filet knifes and my other skinning knife. i also have a hand held sharpener and it goes with us hunting. i would buy a good hand held sharpener over an electric any day. you can stop half way through skinning an animal and in 2-3 swipes through the sharpener and your back in business.
For sharpening at home I use a Chef's Choice 2 stage sharpener. I have no complaints with it and have used it for at least 5 years.