That's one of those "I'd never buy it but wish I'd thought of it" things. I'm sure they sell because of the wow factor. Funny "reviews" and customer images too.

Yep, I prefer the old school manual technique, and it all depends on what thickness I'm in the mood for that day. Product in left hand, knife in right, thumb on top as the cutting board. Lick the thumb and rinse the knife when done. Make sure you get the last part right. grin