I've been trying these guys since they were the strongest and most unique beer in the world. In 2002, they were a solid 5.0. They haven't changed, but the world has caught up. They are still an awesome beer, but there are actually some better beers out there. I'd give them a 4.25 nowadays.
The beer has a ton of flavor for so strong a beer. It has a dark, syrupy flavor, but without the thickness of some versions of this beer. The flavor lingers on the back of the throat for several minutes, but doesn't have a bothersome aftertaste.
This beer is also a decent value, compared to some of the extreme beers out there. $5 a bottle may seem like a lot, but look around at some of the competition. It's worth it!