I owned the first version but did not have the Blade Grinding Attachment. I ended up not liking the results I got and found it wasn’t as foolproof as I had hoped. Fast forward to the release of the Mk.2: I bought it just because it came with a limited edition badge. That’s how ridiculous I am. I found the cassette with the guide to be just as difficult as the first time around. However, this version came with the Blade Grinding Attachment, so I figured I’d give it a whirl. It ended up being awesome. There is a learning curve, but I swear it’s less steep than using that guided cassette. I first practiced on my brother-in-law’s knives because he sucks. They turned out to be pretty sharp, and I didn’t screw anything up! With practice, I started to feel more confident and began to sharpen my own kitchen knives, then my pocket knives, and even some random things like a machete and a karambit. Now, I feel confident using it and love that I can use it as a belt grinder for flattening the spine or even thinning a blade. Answer from Sir_Toccoa on reddit.com