Got sample vials of 3 Boadiceas (after buying Amouage), complex, adventurous, and energizer.
Tried Complex first. Wow! This is big. I was planning to smell some more samples tonight, but I'd have to give up. Just a dab with the plastic stick of the vial and I cannot smell anything else. (I dabbed adventurous on the other arm, but I cannot smell much, if I dig my nose I feel a faint fruity floral, but that's probably an hallucination.)
I'm only 1 hr into it. People talk about animalic, so far I don't get any. To me, it's like the darkest, bitterest vegetable, with some of the mossy, decomposing forest floor. Makes me think of some Italian liquor bitter (an acquired taste, for sure), but perhaps one that has by mistake thrown in also some poisonous plants (has anyone ever smelled hemlock or jimsonweed? there's that fully inedible, mousy smell). I wasn't thinking about leather, but after reading the reviews above I must say that the bitter darkness of Complex could indeed recall leathers.
Among existing perfumes, the only one I can think of is, as others suggested, Grey Flannel, but only very distantly so. Complex has none of the chemical green-ness of Grey flannel, and smells more natural (from some deep obscure forest, that is).
In any case, I'll see if I can resist for the whole drydown, but this is a bold, interesting thing that may make it on my to-buy list. Now, this was a dab - so I can hardly imagine what a spray would be.