I've not smelled Black Aoud, so keep that in mind, but Original Aoud is very aoudy, with very few supporting notes. It starts out warm and medicinal and turns into a dry/sandy/woody smell which most closely smells like labdanum with a bit of the grassiness of vetiver. I don't know if it's the same aoud smell in Black Aoud but it is the same aoud I've noticed in many other Montale frags (Sliver Aoud, Crystal Aoud, Golden Aoud, etc).
It's very very dry and warm. Meditative, I'd say. If that sounds like the component you like from Black Aoud, I'd definitely say it's worth sampling. One of the best 'dry wood' scents I've smelled, and the only Montale I've sniffed yet that I'd ever consider owning.