I have a similar tool from Lansky. I find it mainly useful for jobs where you dont have a decent edge to begin with, so you can give it certain angle and so on. For knifes that do have a proper edge, but are just a bit dull, I prefer the oldfashioned big stones. Very handy are also the "steels" that you find in butcheries and restaurant kitchens. Those are not so well suited for outdoors of course. But for the kitchen knifes they are perfect. A few strokes before each use of the knife, and its always sharp.
But those are the only sharpeners that work "quickly", and that only if used regulary.
Everything else that promises a fast and easy sharpening, is crap. Especially electric sharpeners. A real good sharpening from scratch always takes some time, if you want to do it properly.
A tipp for the finish: a piece of firm saddle leather glued to a foot piece of 2x2, treated with a very fine polishing paste - it will give the mirror shine edge finish, and you can shave with that knife. If you dare... :)