My husband just went to Japan on business, and when I told my mom she went crazy talking about camellia oil. She said it's the best thing for hair/nails and I have to try it. My husband was going to bring some back but he couldn't find any, so now it's on my Amazon wish list.
So, to answer your question: I haven't tried it but I know my mom certainly loves it.
I haven't tried the oil itself but I use the Tsubaki conditioner from Shiseido and I love it. It has tsubaki oil in it. It's so moisturizing and it smells good(in my opinion). My hair behaves better and is not as dull and not as tangled and not as dry as before.
I heard that the oil itself is the best though..so yeah..give it a shot.