This post is about a knife sharpener that my son gave me recently. It consists of two tungsten carbide blades and a suction cup encased in a plastic holder and is called the "Edge of Glory". There are two unique things about this sharpener: 1) It works very well; 2) It costs less than $5, although some places sell it for as much as $12. My son bought it on special at a local store for $2.99. Bed, Bath and Beyond has it for $4.99.
I've been an amateur woodworker for many years. I'm used to getting the keenest edges on my tools using specialized equipment and Japanese waterstones. Trust me, I know a thing or two about sharpening blades. I also have a Chef's Choice electric knife sharpener, the one with three diamond wheels. It does a good job, but takes a bit of patience to use.
In contrast, the Edge of Glory is a no-brainer. Merely stick it to a non-porous surface so that it doesn't move and draw the knife though it. It will handle any blade length. Unless your knife is quite dull, one swipe will do the trick. The whole job takes less than 5 seconds. An added benefit is that it takes up hardly any room and you can store it in your kitchen junk drawer.
I did an Internet search on knife sharpeners and found a few others using the same technology, but they cost more. My guess is that they are all the same, probably made in the same Chinese factory.
In any event, I recommend that you try one. I know you will be pleasantly surprised. Be aware that you will still need to use a honing steel or ceramic rod to keep your knife blades aligned.
Tungsten carbide (chemically WC, called "Carbide" in the trade) is one of the hardest known materials, equivalent to that found in sapphires and rubies. WC is easy and cheap to make and today is the material of choice for many metal and wood cutting tools. It will stay sharp roughly 50 times longer than high-speed steel. That said, it is not suitable for ceramic knives which need to be sharpened with specialty abrasives.