The book comes with 2 disks, one for units 7-9 and the other for units 10-12. I received two 7-9 disks, but one of them was labeled as a 10-12 disk so I didn't know it was wrong until I tried it! After contacting the seller, they sent me a replacement 10-12 disk so overall I'm quite pleased with them. The book is fine, but no replacement for watching someone sign (so the disks are very helpful). I got the book for a class.
Rating:
[4 of 5 Stars!]