Yes. Some parts are kind of annoyingly "rah rah positivity." But it has lots of extremely usable tools. Just skip anything that annoys.

Caveat: this stuff is WAY easier to use with a therapist, in part because the therapist will distill it for you and do the skipping for you. However, people do use it by themselves and I know that they at least sometimes get good results from it. Feel free to email me. CBT is one of my specialties, so I can at least answer questions.