fwiw I have bought and enjoyed the
Polynesian Gold™ 70% CO2 Extract - 10g Jar
I find the consistency can vary. Sometimes it is grainier than others. Sometimes more oily or sticky. Also sometimes a bit more tangy in flavour, which is very nice, btw. The taste is always fine, IAE. I've found it to be of consistent quality regardless of consistency or taste and whether I got it from Amazon or directly from RoH, as I have done both.
The effect it has on me is about 20 - 30 minutes of euphoria and for this reason I like it occasionaly when that is all I want, without the euphoria followed by heavy mellow feeling that I get from euphoric kavas, where time is a factor. Sometimes you just want to enjoy that feeling for 20 or 30 minutes and then go on with doing something else rather than being committed to a sesh.
The other main use I have for it is when I want to drink a heavy kava but want to add a euphoric element to it, which I find very enjoyable. For me it greatly enhances heavy kavas that I might otherwise pass up on.
And there's those rare occasions when for a treat, on a weekend evening, I want to drink some grog, eat a couple of candies, drink some KWK concentrate, chew on a dried waka root and have some of the Polynesian Gold. And yes, that is as nice as it sounds.