the problem with the one you guys are talking about, is that its basically a belt sander.... and removes a TON of material... yeah it will work great on the cheap 3 dollar Rapala knives like Andy said, and even 15 dollar Rapala, some Victor's and even Dexter's and other fillet knives...

but, i wouldnt be caught dead using them on my Cutco's, or Wusthofs or Henkels...

now i know most of you will probably just tell me im full of sh!t, but go ahead and look at your knives in 5 years after using them....

wont be much fun replacing 100 dollar fillet knives...

cheap knives, machetes, and the likes, the WSKTS is fine... expensive knives, chisels, plane irons, only way to go is stone stone stone... the rod kits work good as well, just alot more stuff to mess with, but they are still great and do a very fine job...

you also have to remember that belts flex, and you can get concave cupped edges even if you cant see it, its there... and thats bad, it reduces the integrity of the edge, makes it brittle, and wont last as long, then, you have to completely re edge it removing even more material, and repeat process till you have a nub for a blade after a few years...

the ceramic/stone disk grinder/sharpeners, can also remove a ton of material, but if you know how to use them, they work great, like the Chefs that was mentioned, and other really high end models, including the 300 dollar WS machine...

matter of fact, ill show you in a bit what happens when some dipwad gets ahold of your 90 dollar knive and uses a machine like that and doesnt know what the hell they are doing looks like....