I have the Osho Zen, very pretty deck, very, very hard to read with and I've never been able to read with it like a tarot, I use it more as an oracle. If you like the images online then you'll probably connect with the deck.
The book is a bit of a hard read, I felt like I was being talked to instead of me reading what should be an instruction book, it doesn't come over like that.
The one thing I do remember is when I got my deck all new and factory sealed, all the cards were out of order. It took me around 2 hours to get them back into order and to make sure I had no doubles - its not a traditional deck and many of the titles have been changed.
If you've already fallen in love with the Osho Zen, then you'll probably end up getting it anyway but at least you'll know what you're letting yourself in for.