Superb drink, but strongly recommend reducing the sweetness. The bitterness of the Suze really adds depth, but it is knocked out of whack by the Amaretto and the Simple Syrup. I bought a bottle of Suze just for this and I am glad I did!
Not a patch on the Genever/Curacao variant in my opinion, this one is too sweet. If you're really keen on OT gin, dial down or omit the Maraschino altogether.