I finished this a week or two ago and yes, I hadn't read it before. I'm a little (or a lot) slow on some things. Anyway, I liked it in many ways, especially as a reasonably good history (probably) of what it could have been like to be a geisha before and after WWII.
However, I wasn't much interested in the major plot point and I didn't find Sayuri to be a particularly likable character, and other characters came off badly even though it was Sayuri who had treated them badly to get what she wanted. I wasn't drive by the plot to finish the book, but by the feeling that I was getting a glimpse into a piece of history (even if it was exoticized).