So, I recieved my package from Umami-Chaya and it almost began very badly, however this had
nothing to do with the tea itself
or the vendor for that matter....This morning (Mon 20th) I went round the back of my house to unlock my back gate and to my absolute horror I spotted my order lying on the ground! It appears that the postman had just dumped my parcel over my gate when nobody was home rather than bothering to fill out a 'while you were out' slip! I suspect it was a contract worker filling in for our regular postman, however I shall definitely be making a complaint to the Royal Mail. To make things worse, the box was totally saturated with rain, meaning it must have been there since at least Saturday as we had heavy rain on Sunday! Fortunately because the tea was properly packaged it didn't get wet, but as you can probably imagine, I was not best pleased!
Anyway....
I've just finished my first session with the Yame Sencha Kurogi Supreme and am very pleased to report that I am rather impressed with what I have received! The aroma of the dry leaf was beautifully vibrant and fresh. The tea is sold as a "chu-mushi" or "mid-steamed" and I would say this is about right, as the leaf is a nice mixture of needles and smaller pieces. (Worth noting also that the vendor had just added a Fuka version of the same tea!)
The parameters I used in my pre-heated Kyusu were 4.5g leaf, 160 ml water, 70 *C, 50 secs, 30 secs, 1 min, 2min (slowly increasing temp)
Now I've made the mistake of trying to describe in detail the flavours and sensations of a tea after one session before, so I'm not going to do that this time! Briefly though, the tea had a wonderful grassiness to it with a only a slight astringency - this intensified on the second steep and the third was wonderfully light and sweet. Next time I might adjust my parameters slightly to try and get one more steep out of it, but to be perfectly honest I was quite satisfied with just the three!
Overall then, the impression I get is that this vendor is dealing in some very good Japanese tea, and based on my enjoyment of this one I could probably see myself re-ordering from them.
Hope this is helpful!
Jack
My credit card statement says "OCHA ... AZ". That's the abbreviation for Arizona and that is where your site claims the business began. But nobody here ever said you were still shipping tea from Arizona. I think you've missed the point of this thread. 
I'm looking forward to your guinea pig review!