Okay, so I've had a little under a week or so to play with my Jyar. Ordered a single black unit to test out and so far so good! The jyar is smaller than I expected, being literally the size of two film canisters, stacked on top of each other... but thats including the plastic outer shell. Look inside and the glass vial which contains your flowers is even smaller.
Still, I was able to put a 1/8 of ground flower in it with some room to spare. And thats completely loose, not packed down at all. I'm sure I could fit almost a full quarter if I really tried. I wouldn't want to though, because as is, I can just stick my Solo stem in there and pull out a near perfect loaded bowl. Also the size makes it very stealth. You can have it in your pocket without any undue bulges, etc... which is nice for people on the go.
On the downside, however, the size makes it not ideal for storing nugs. If you had some fluffy herb I could see maybe 1g fitting in there without smooshing things in. Sadly, this is something Id like to store with these but its not really an option given its limited volume. The TLDR of that is WE NEED LARGER JYARZ (yes, I know they are working on it)!
Also, I found a slight issue when removing the glass from the plastic sleeve. I had about 1/4 of the glass filled with finely ground herb. As I removed the glass, static electricity caused some of my herb to jump around inside the glass and even out of the jyar! No bueno. Anyway, its a minimal gripe and it only happened that one time... however I thought people should be made aware of that potential problem.
All in all I give these an 8.5/10. I'm sure that will change once there are more sizes/types available. That being said, ill be buying at least 2 more of these so I can keep different strains on hand when I go out.