I am more of a Blue Moon person...but I really liked the Thirsty Frog..IF
(note the IF) .... it is not bitter....
it was fine on the Magic...but...
I have tried it on several ships since the Magic and have found it very bitter on the Elation (at two different bars) and slightly bitter on the Conquest.
On the Spirit, it was fine IF you got it at an inside bar (casino) but IF you got it from the Serenity Deck outside bar, it was bitter.
so always ask for a "taste" before you buy.
IF I am remembering correctly it is $5.50 plus tip per glass. (and it was a good size glass)