My first recipe was really disappointing. I used Bacardi 8, Plantation Dark rum for the float and my DIY Falernum liqueur (which is pretty good). I tried a second recipe and it was quite good (but not great): Plantation Barbados, Plantation OFTD 69% for the float, my DIY Falernum liqueur, 15 ml lime juice and 5 ml rich syrup (2:1). It is possible to make this cocktail better by changing the rum, so as Simon Difford said: your choice of ingredients! This cocktail can range from 1 star to 5 stars.