I made a mug with a moderately-heaped teaspoon and brewed for five minutes, boiling water (the tasting notes on the site have five minutes while the instructions on the sheet say two to three).
This was nothing very special: quite dark in the mug with a very slight metallic aroma; in the mouth basic tea – not very strong, a hint of digestive biscuits or similar, a slight hint of butter.
I made a second mug with a well-heaped teaspoon and brewed for five minutes. It was not really different to the previous mug.
Rather disappointing, this one.