I bought the original Work Sharp, then went to look something up and saw the KO edition was coming out a month later. Sharpened all my knives with that one, and took it back to Bass Pro. One month later when they had the KO in stock, I went back and bought it from them. Eased the pain of being "that guy" to buy something, use it, and return it.
I love my WS. I can sharpen all of our kitchen and my couple of utility knives, fifteen at last count, in about 30 minutes.
Disclaimer: I would not use it on a fancy, decorative, or expensive knife. Maybe I don't pull back right, but I have rub marks on the upper part of the blades where they rub against the guide as I draw them through. I've talked to WS about it. Thought they should cover the guides with some felt, but they said this would change the blade angle. They suggested putting painters tape on the blade. I asked, wouldn't that change the angle of the blade too? She laughed and said umm, yes. I let it go. I don't have any fancy knives, so I'm not really worried about it.