To me, the brand doesn't matter, as long as it's gyokuro.
A few months ago I tried to buy some online, but couldn't find any because it was not the right growing season.
Well, maybe someone had it, but it was way overpriced.
So, I went over to Whole Foods, thinking I could buy a small amount there. Even though they charge too much, it wouldn't really matter over a quarter pound bag.
They didn't have any either, so I ended up buying something that looked similar, I think it was Sencha.
To me, it was drinkable in that it was liquid, and it was tea. But with every sip there would just be something missing or wrong. Like if you had a kind of coffee you loved, and then had to drink some generic blend for a week. You'd do it, but wouldn't really enjoy it.
Anyway, I just looked where I bought my last batch of tea, and it was from Arbor Tea
online. You get free shipping if you spend over $50.
By the way, I tend to drink the tea hot at work, but when I'm home, I'll make like a gallon of it for ice tea to drink over the weekend, especially if I'm going to be working in the garden an sweating. I find it quenches thirst better than anything.