Tasty, but on the bitter side. To make something that's more balanced for the Tiki palette I've found that swapping the Campari for Select and using brown sugar syrup instead works wonders.
I also used Select Red Bitter but went with the 3/4 oz from the original recipe since I don't mind the bitter. This is a good place for a "funky" rum. I used Smith and Cross. I kept everything else the same as Simon's recipe. Very good!