Own a cube, have experimented with it for a couple of months. In terms of adherence, it's the best chalk ever, unfortunately, it also adheres to the cue ball (the dotted measles cue ball in particular) much better than any other chalk, which I happen to find a HUGE problem. Other than that, it's true one can play several racks without chalking up, although I've now figured out I could play whole racks using either Masters, Blue Diamond (my third favourite) or Cosmo (my second favourite). All these brands will do as far as I'm concerned, although in different climates, my preference might change (chalk invariably works best here in dry winter, other seasons can be a problem for e.g. Masters). What I'm using my Kamui chalk for now is every time I have to reshape my tip, or when I'm putting on a new one, I'll put a bottom layer of Kamui on it until the roughened-up tip surface turns smoother again, then use e.g. Masters or Blue Diamond over it. In other words, at this rate it'll serve me a lifetime, putting the price into perspective. Thus far, I couldn't find a single type of shot I do better or worse using Kamui chalk.
Greetings from Switzerland, David.
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„J'ai gâché vingt ans de mes plus belles années au billard. Si c'était à refaire, je recommencerais.“ – Roger Conti
Glad, that someone else also is doing the same

I also use Kamui as a layer -and then just the regular chalk. Works great. But really looking forward to the newer version 1.21, where the problem with the CB had been fixed (i m curious^^).