Oolong hits with what's easily the best lime blossom I've ever smelled in a perfume. My guess is that it's the real essence, because this, like other Zents perfumes, is quite oily.
Behind the lime blossom, there's some subtle green tea (but not much), as well as something peppery, but mostly just a ton of really strong floral soap smell. People looking for a tea perfume will likely be disappointed, but Oolong may be grail material for people who love the smell of a lime tree in full bloom mixed with soap.
Not for me, but this will make someone very happy.