I did lots of research to find the best knife sharpener for my needs and was pointed to this particular model (I think the reveiw that sold me was from Cook's Illustrated). I did not need a scissor sharpener and I did not have Japenese style knives so this model was perfect for my high quality German knives. I most recently bought this for my sister-in-law since I've used this in my kitchen for years now. If you have good knives, or even cheaper ones, this is a must to keep the edges sharp and soft tomatos from becoming a challenge.
Stay away from all knife sharpening tools made by Chef's Choice. Cheap materials, shoddy craftsmanship, sub-par abrasives. After sharpening on this machine all of your knives will have a burr or a rolled over edge making the knife unusable. I had to resharpen and hone my knives by hand after using this piece of junk. You are far better off with a good stone and a keen eye. If you want to ruin your good knives, just pass them through this monster.