I m using the Kamui now since it came out.
I prefer also the 0.98 -( 1.21 also good chalk!) and i use it for sure much more often than necessary. And the first cube hold also for about a year.
What i really like is the *feel* when i chalk the tip.
My opinion is, that Kamui was also for sure good for the *chalk world*. Of course Masters and Blue Diamond did their job, too- but since Kamui came out, more and more new stuff is coming out. Just to name Predator Chalk-which is really really good for the money! and furthmore the Z9 chalk, which is also nice.
But i still use Kamui-have enough to be fully equipped for a longer time
and next to it, i will now have some Predator chalks also in my pocket. (just for the case i get robbed

)
thumbs up for the Kamui Chalk