Incredibly dusty!
I wouldn't recommend Cat's Best Oko Plus litter to those who are sensitive to dust/are asthmatic.
This litter tracks all over the place, and I mean, absolutely everywhere in the house. I have had chronic chest infections and bronchitis-like coughing whilst using this litter. Soon after I stopped using it for a while however, my chest was a lot better. Then I used the litter again several months later and the chest congestion came back, just like the last time. That's how I finally made the link.
Other than that, yes Cat's best is economical and is a great clumping litter--just not meant for dust-sensitive people, furry and otherwise.