I have an old KAI. It's the teal and purple one, no frills. I think it's from the 90's (maybe 80's??????) 45mm blade and small, thin handle which fits my hand well. I dislike the ones with the thicker handles, they cut OK, but tire my hand. I also have a Martelli ergonomic 45 MM that I also like. When I have a lot of cutting to do, I find that if I switch back and forth between these 2, I avoid hand fatigue.