I have a pretty damn impressive grind system. It has two CBN wheels, a diamond wheel and a common grind wheel (four wheels). It came powered by a 220 volt, 1 horse motor. However, via the magic of garage sales, it's now pushed by a 3/4 horse DC motor and controller (complements of an industrial sewing machine). Now, instead of running a around 1,700 RPM, it runs at what I set it at, between 0 and 2,400 RPM's.
I use it to profile and sharpen my lathe knives, but it will NEVER touch any of my good pocket, kitchen or hunting knives, unless they had a huge nick and I wanted to start off with a straight line to work from. Said another way, there is no electric "sharpener" I'd risk my knives to, unless I did a lot of work setting up a jig and ran the grinder at around 300-500 RPM's.
I lack the ability to play the muscle memory game. So do most, if they get challenged to sharpen the fifty or so blades (draw knives, lathe knives, chisels, lawn mower, kitchen knives, and so on) found in my shop or house. All it takes is flipping the knife a degree or two and you set yourself back minutes.
In the end, I rely on a jig. My current one happens to be called an Edge Pro. The one I'm building borrows from the Wicked Edge, but flips everything around to solve some of its problems. And it cost me a lot less to build.