I have not tried the OG but I own Carlisle which it is often compared to. Compared to Carlisle, this is drier and more "amberwoody". More focus on tobacco and wood while I think Carlisle focuses more on vanilla, apple and cinnamon.
IRT also has a synthetic oud that pulls a little in the leathery direction, maybe even approaching barnyard territory before settling down. The leather lasts quite well and would probably be what stands out through the perfume's lifetime. Performance is great and I easily get 12+ hours with decent projection throughout its duration. Your shirt will smell until you wash it.
On a side note, I think this type of fragrance falls into the "pseudoniche" category. Such fragrances that are marketed as complex olfactory works of art but are actually quite simple. I like it though. It is sexy and easy to wear.
A solid 8.5/10
My girlfriends comment was "Very good. Strong without being obnoxious.". Which I would say is a good grade considering she is 30 weeks pregnant!
