Good, but a bit boring. Used regular Cointreau as I didn't have the "l'Unique" version. Also, I don't understand why there would be lime cordial AND sugar syrup...seems redundant. I omitted the sugar syrup & it was sweet enough. Might try to zhuzh it up next time, though there are so many other recipes, why bother?!
Regular Cointreau is now called Cointreau L'Unique, so you used the right liqueur. Thanks for the feedback on sugar syrup; something others agree with below. I found the cocktail too tart without syrup, but I have halved the measure.