Top critical review
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NOT TO BE USE OFTEN
on 11 March 2009
This added after using the product for a month or more: 13 April 09: I am not saying don't buy this tool; if your knives are really bad it will work fast to get an OK V that seems really sharp. Now you have that V, you need to keep it, that is what a sharpening steel does without grinding or as with this gizzmo cutting loads of metal away. Try this, see how much swarf (metal shavings) are produced with this. It takes little time to loose 1/128th of an inch to a 64th/inch of metal/your blade, that's approx 1mm. Measure your knifes depth. If it is about 1.5 inch you will make it disappear after 64 to 125 sharpenings. Your knife is then knacked. Sharpen your knife every time as one should to keep the edge as the pros do, your knife will be gone pretty soon. lesson, use the right tool for the job at the time. Use this when you haven't kept the edge with a steel, not often if you like your knives. Better still, use a sharpening steel or Taylors Eye Witness Classic Chantry Knife Sharpener on every use and you will have your knives sharp for life and as good as new...original review follows.
I have to agree with the comment others have made that with so many ad like glowing reviews one has to wonder how many are generated by the company marketing this product. Add to that the slagging review for NEW KNIFE SHARPENER  which is almost certainly the same product, or someone should be getting sued for patent infringement.
OK a product review. I got this today and it uses the same technology that has been around for decades, most likely carbide blades set at an angled `V'. The suction system, again a take from old tech works and is a good redeployment of this idea. This type of product comes into its own when one has a really dull blade when a steel isn't enough and that would require a lot of time using an abrasive system such as ceramic or diamond stones. On the subject of diamonds, they describe the product as having "diamond precision" which without doubt is misleading and an attempt to make the buyer think they are getting a diamond based cutting edge.
This sharpener removes a lot of your blades metal very fast, which if over used will wear your knives out very fast. This system really isn't abrasive, it is a small cutter that cuts a new edge which as any engineer (I am an engineer) will tell you, is by nature rough not razor smooth finish. I found that while it is actually good for resetting the blade angle if used with care, using other sharpeners that are less severe afterwards, resulted in a much better edge that cut rather than tearing; I finished using a V steel system.
If you want to see how to keep knives sharp, watch a pro, a butcher who will sharpen their knife after every cutting session, many times a day. They use a steel, which doesn't remove metal and in effect damage the knife by shortening the knife's life.
Bottom line is use with care and rarely. Best to get something like the Taylors Eye Witness Classic Chantry Knife Sharpener and use it on every use of your knives so that you really never need to use such a drastic method