Is the AAQ-II that bad?

The AAQ-II has been criticized because factor analyses suggest it measures neuroticism or negative affect, leading to proposals to reinterpret studies. The authors argue this is due to inconsistent use of the AAQ-II as a measure of flexibility or experiential avoidance rather than psychological inflexibility. They evaluated its discriminant validity in three Colombian samples: Study 1 (N=2398 and N=358) with EGA and EFA against DASS-21; Study 2 (N=444) also included the BFI-2 neuroticism subscale. Results indicate a single factor and support discriminant validity. They recommend using the AAQ-II only for inflexibility.