It is excellent. Here in North Carolina, I've only seen and drank the 60 and 90 minute. I thought you were joking about the 120 Minute, until I googled it. The Dogfish Head website says, "Clocking in at 15-20% ABV and 120 IBUs...". I'm assuming the ABV is alcohol level. I didn't know it was possible in beer.
I've had some double IPAs up to 13%.
So my 90 minute was very good. How's the wallop of the 120?