Directly related to Paper Plane - I like this better. The tart whiskey sour element is still there, but additional structure and notes from the Green Chartreuse are also expressed, adding dimension to the cocktail. Try it head to head to see what you think.
Nice, and excellent if you're looking for a way to drink Becherovka. The Becherovka wrestles with the maraschino and lime (Becherovka leads controls most of the taste, then the maraschino and lime assert in the finish). The cocktail is on the tart side, and as suggested earlier by another reviewer, would likely benefit from a egg white to make it a fizz.
An excellent cocktail - IMO it falls short of a Last Word, but it is a delicious variant to have if you are out of your favorite green liqueur. And, given the name, it might be fun to have one of these, and follow with a Last Word, and compare and contrast the cocktails and the impact of the substitutes. The heavy pour of gin here does leave you with more prominent gin notes than an equal parts Last Word.
Really an excellent cocktail - but the mastiha does not quite fit the hole left by the maraschino. The mastiha has a delicious and distinctive flavor profile, and it works well here - but not as well as the maraschino IMO. And with Green Chartreuse so expensive, I will prefer the original Last Word over this variant. But, still and excellent cocktail, and worth a taste.