I have this. I took a knife skills class at Sur La Table and the instructor used it. He keeps it in his bag and takes it with him everywhere. He said it's a really good one for the price. So I bought one and am pretty happy with it. That said, I'm not an expert on knife sharpening. My test is to run it through a piece of paper after sharpening, and it slices pretty well. I haven't compared that degree of sharpness with slicing paper after a professional knife sharpening.
As cowboy stated, it looks ok, and will be better than not sharpening your knives. However, it will not be as nice as a sharpening whetstone and therefore it will not reveal the true potential of your knives. An average knife which is sharpened correctly cut much better than an expensive knife which is sharpened averagely.
Unlike cowboy, I think this sharpener has one flaw compared to the roller sharpeners. Typical roller sharpeners come with two grit sizes and this Ozitech thing only has one. Consequently, its surface either is too fine to repair a fully dull blade or too coarse to polish the finish products. I do not know its grit size, but I know it cannot be both (fine and coarse).
I don't have any experience with it, first off.
If it's well made, I would suspect it would work comparably well to a roller sharpener (which is to say better than not sharpening, worse than most other more expensive or time-consuming methods). And it's priced comparably, so if that's what you want, go with it.
If you do get it though - don't sloppily bang your knife into the sharpener and drag it across it like they do on that video. Apply the knife gently, use light, even pressure and a smooth stroke.