I do not own either, and learned freehand a long time ago. As a student of learning, assistive and adaptive learning tools are always worth considering. Are you currently free-handing?
Interesting. As a free hand guide, you can compare it to
Gritomatic's guide:
The market is flooded by $10 Chinese angle guides. They all look the same. And they share the same problems: they damage sharpening stones and they are damaged by sharpening stones. And you cannot choose the angle.Hapstone T1 Adjustable Angle Guide is different. You can set any desirable...
www.gritomatic.com
The Knifemate is a nice bit of engineering, always makes me smile. Thx. I look at the price though and my mind immediately pauses, and I think about buying Diemakers bonded diamond stones instead, for the same scratch.