I have owned and used extensively the Wicked Edge, KME, Tormek and the Edge Pro systems as well as many of the less extensive crock stick style systems.
The KME is my favorite by far.
The Edge Pro is what I bought back when they were still a young company and I used it happily for about 12-15 years. Even though they weren't the first guided system for a long time it was the best and only truly precise one on the market. The down side is they are messy and use a lot of water. Now they probably have diamonds but I have not looked at the market in a while.
I did not like the Wicked Edge because I hate that the tip is pointing away from me while sharpening. The tip is the most important part of sharpening and I like to be able to get up close and personal at the part. They are prone to rounding the point if you are not very careful.
The Tormek style sharpeners are nice and I love the system but their fatal flaw is their knife clamp, it's not self centering.. total deal breaker.
There are other systems out there most of which are derivative of one of the ones mentioned above aside from maybe the TSPROF which I have not tried.
Finally, I am a huge fan of the Spyderco Sharpmaker. I use it for small blades that don't work well in a jig system but more often for maintaining the edges I set with my KME. I always set my edge between 14-18 degrees based on the steel and then use the 15 or 20 degree setting on the Sharpmaker to deburr, hone and resharpen. My favorite edge on modern steels is a 14 degree primary bevel with a 20 degree micro bevel at the final cutting edge. Makes them very slicey and durable enough for everyday use.
I also have a variable speed belt system I made using the KME clamp as the holding mechanism, it's quick and easy but I still occasionally like to do them the manual way.. Adjustments to the angle are made by raising or lowering the bar the guide travels on.
