Befitting its name, the flavor of the Equinox ESB is dominated by bitterness, but it's not unpleasantly bitter at all. There's no taste of malt sweetness to speak of; the beer's entire flavor is dictated by the hops. Since the Full Sail brewery is in Oregon, I'd guess that these are Cascade hops, of which I am a huge fan. The main flavor that I get initially is lemon rind (a bitter lemon taste), but that doesn't last too long before it gets replaced by a more generic citrus flavor. Since it only has 5.7% alcohol by volume, you can't really taste any alcohol, which contributes to the smooth taste of the Equinox, despite its bitter flavors.
Rating: 8/10. If you like sweet beers, this one has absolutely nothing to offer you. It's about hops, hops, hops. But if you're a fan of pale ales, IPAs or ESBs, you will enjoy this beer.