Compared a sample of this directly in a blind tasting against Den’s Zuiko.
I think as others have reported, it must be very temperature sensitive. The first brewing had a lot of bitterness and was also fairly astringent. I still liked it, actually; I can tolerate a lot of bitterness and still enjoy it. However, I don’t remember much else in terms of flavor, though I’m sure my memory isn’t serving me well here. I did like it, but I knew that the other I had tried (at the time I didn’t know which was which, as it was a blind tasting) was better.
Also, I steeped each 3 times, and by the third this one was already spent (tasted mostly watery).
For only one shot, I’m going to give this a little benefit of the doubt, because I did like it, in spite of it having more bitterness/astringency than I expected.