This was outstanding. But you MUST love agricole rhum or it will not taste correct for you. The grassy and funk nature of agricole works perfectly.
I used a Martinique rhum, a high proof Caribbean blend by Hamilton, and a Hamilton Black Jamaican Rum. The mixtures of the unadulterated rum from Martinique and Jamaica work wonderfully together.
On my favourites.

This is a strange cocktail... the rums I used were the (suggested) J.M. Terroir Volcanique, Appleton 8 year, and El Dorado 15 year - all rums I very much enjoy neat. I do have a bottle of Carpano Antica, but it's not open and my Dolin is (and I'm not going to waste vermouth lol). I also used my homemade pimento dram - which is boozier and allspicey-er, but less sweet, than St. Elizabeth.

Owing to its similarity to a Manhattan, and knowing my allspice dram and vermouth were a bit drier than the suggested, I garnished with a Luxardo cherry instead of an orange zest, hoping to add some sweetness. While I am enjoying this cocktail, it would probably be better with the Antica - as-is, it's pretty austere... and while enjoyable, I'd rather drink the rums neat. It's not bringing anything extra.

It's pretty good. It's a triple aged rum manhattan, what more do you need?