I think there is no simple answer to the question as there is no one size fits all sharpener but maybe a couple of questions and my experience from owning both will help.
What kind of sharpener are you, do you enjoy taking your time to get perfect edges or do you want fast results and is a working edge good enough?
What kind of knives do you sharpen most or do you want to use with the sharpener?
What kind of edges do you prefer?
I very much enjoy the sharpening process and like to have the best possible edges on all my knives from the smallest Victorinox classic to my biggest kitchen knives and therefor I have different sharpeners so for each knife I can use the one that gives the best result.
The Work Sharp can give good and fast results but it certainly has a lot of limitations as well and it is very easy to make a mistake and ruin your knife, get scratches on it or round the tip so if you choose this one than make sure to read the manual and practice on cheap knives first.
I use it mostly for larger work and kitchen knives for which I just require a good working edge and don't care a lot about cosmetics. Although with practice and care you can also achieve very nice looking edges, I will never use it for my better knives.
The KME is a very nice system and although it of course also has it's limitations, I use it for most of my pocket knives and also for my 6" Global kitchen knives. What I love about the system is that it is very flexible and that you can buy lots of accessories so you can adopt it to almost every type of need. Perhaps not important for everyone but something I valuate just as much is that KME is a small family owned business and their customer service is second to none even for foreign customers like me.
If you like the sharpening process and enjoy the satisfaction you get from achieving such perfect results than I would absolutely and without hesitation advise the KME.
Here is a picture of a knife I re-profiled this morning. I used the 300, 600 and 1500 grid diamond stones followed by the black Arkansas and the Kangaroo strop. It push cuts cigarette paper with ease and has a beautiful mirror finish.
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RR228_KME_01 by
Frans van de Kamp, on Flickr[/IMG]