I bought a pound of them from my LHBS. I made an all Zythos Pale Ale.
It was either Maris Otter or 2-Row @ 93%, and then about 7% of C40 or C60.
Then I did 60m, 15m, 5m, 1m, 0m for the Zythos....around 55IBU.
I can say that I did like the Zythos hops, but I think next time I will bitter with something different. Chinook, Centennial, Columbus, and then use the Zythos at the end.
I don't think it had a very intense bittering quality that I want in an IPA. I could see it being good in an Amber Ale as bittering.
just my 2 cents.