This series for learning Chinese is not without some minor issues, but certainly will recommend this over Integrated Chinese as it a lot cheaper, comes with the audio. (Yes, I know both... part of language teaching).

The included audio recordings are of a very good quality. The thing I disliked the most is the size of print. It feels a lot like large script for people with a reading or visible impairment or it trying to aim different level of learner's (including college level). It makes the books large and unnecessarily thick. Especially noticeable since it lacks a digital version.

If you want to learn Chinese, these books can help you a lot to master the basics to even intermediate level (book 1-4) and some advanced (book 5-6). Use the newer updated 2nd edition.