i bought one of those recently, too. i was very disappointed. i get much better results with the sandpaper sharpeners (although they required a LOT more elbow grease).
i'm looking around for a different brand of cutter, though, because i'm not sure the sharpener is the problem. when i find what i'm looking for, i'll either have discovered the blades are better sharpened than i think, or i'll have wasted yet more money on a new cutter. :lol: