The MK2 is the more budget-friendly model. It comes with a fixed angle guide  (20 and 25 degrees), a 2-speed motor, and three belts—coarse (80), medium (220), and fine (6000). Setup takes a couple minutes, and once you're up and running, it's fast. I’m talking 3 to 5 minutes from dull to sharp without breaking a sweat.

If you’re the type who just wants to maintain your blades without diving into the technical side of sharpening, this thing is a dream. Pocket knives, kitchen knives, utility blades—it handles them all without fuss. It’s easy to use, and it’s just flat-out convenient.

But it’s not perfect. You’re limited to preset angles unless you go freehand, and with the narrower belts and fixed speed, you don’t have much control. It gets the job done, but don’t expect precision tuning or show-level polish. The MK2 is a tool, not a finesse instrument.

The Ken Onion Edition feels like a completely different machine. It’s built on the same concept, but it adds a variable-speed motor, wider belts, and an adjustable angle range from 15 to 30 degrees. It’s clearly aimed at people who want more control over their edge geometry, and that includes me.

This one took more getting used to. I won’t lie—on my first go, I rounded off the tip of a blade just by doing things a little wrong. You have to take your time, read the instructions, and practice on a few junk knives before you move on to anything nice. But once you figure it out, the Ken Onion Edition can produce an edge that’s cleaner and more refined than I expected from a powered tool.

I especially like the wider belts. They track better and feel more stable on the blade, especially when working on larger knives. The variable speed also gives you more control over heat and pressure, which matters when you’re working with thin grinds or harder steels.

There’s also a Blade Grinding Attachment available, and that opens up a lot of potential for reshaping blades, repairing chips, or even regrinding edges. If you’re someone who likes tinkering with blade profiles, it’s worth considering.

As capable as these machines are, they’re not going to replace my fixed-angle systems or stones. There’s something about the control and connection you get when you sharpen by hand that a motor just can’t replicate. I enjoy taking a beater to a diamond plate or cleaning up a convex on a strop. It's slower, sure—but there's a rhythm and satisfaction to it that I still prefer.

That said, these powered systems are fast. Really fast. If you’ve got a bunch of knives to get through, or just want to maintain a working edge without the ritual, they’re a great tool to have in the shop. And for someone who’s newer to sharpening or intimidated by freehand work, these systems make it easier to get consistent results without much guesswork.

The MK2 is ideal for someone who wants to keep their knives sharp with minimal effort. It’s great for beginners, casual users, or anyone who just wants to maintain an edge without learning a skillset.

The Ken Onion Edition is for people who want more. More control, more refinement, more capability. If you already know your way around angles and steels, and want a tool that can match your standards, this is the one to go with. Personally, I prefer it between the two—mainly for the variable speed, angle range, and wider belts.

Both of these are solid machines, but they’re not magic. You’ve still got to learn how to use them. And if you're coming from a background like mine, used to fixed systems or stones, expect a learning curve. But once you get the hang of it, you'll start to appreciate just how effective and versatile these sharpeners can be.