Borneo Zen is too bright for me at the opening, but the drydown is a delicious skin scent - woody and salty, with a hint of leather and musk (I have no idea what the actual ingredients are, these are just my impressions).
My favourite mukhallat is Arabian Oud's Prince Diamini in its both iterations. To me this is the epitome of Arabian perfumery - rich, deep, luscious, intense, passionate. It is the most powerful (and long lasting) perfume I have ever tried. You literally need a nano-swipe, not even a drop (it would be too much) and there'll be a very radiant and fragrant aura around you for the entire day. Make a mistake of getting even a tiny bit of this onto clothing and the scent will survive for many days and that after a wash! Even though it's increadibly strong, it's not loud or crass at all, just radiant and powerful. I love this one for cooler weather when I want something warm and comforting. There are two versions of this:
Prince Bandzile Diamini - clove, orange blossom, himalayan balsam flower, egyptian musk, frankincense
Prince Majahonkne Diamini - wild rose, oud, clove, pepper, ambergris
There must be tons more ingredients not listed as the scent is so complex, deep and rich (and well blended) that I find it almost impossible to identify any individual ingredients. Both version smell very similar (despite the different official notes listed) but Bandzile is slightly "darker" to my nose at the beginning although Majahonkne has a nicer, "prettier" drydown. Both are perfectly unisex.
This is probably the only traditional Arabic perfume blend that I don't hesitate wearing to the office, there's absolutely no unpleasantness or strangeness to this one unlike many others that have either piercing synthetic musk, or poopy oud or thick amber. If I had to keep just one mukhallat PD would be it (in either of its incarnations).
The only problem with this one is its availabilty and astronomical price. So far I've only seen it in one store - Arabian Oud in London, I don't know if they still have it. The standard bottle is 5 tolas (about 60ML) and the pricing in the past was as high as 10000 pounds and as low as 5000 during their many 50% "sales". In the past, if you asked nicely it was not impossible to arrange to decant it into a smaller bottle thus reducing the price. Nobody should realistically need any more than 3-5 ML of this oil blend to last them a lifetime - it's that strong, and I am not kidding. If you ever get your hands on this - use caution when applying, overdo it even by a tiny drop and you'll clear the room in short order.