New Zealand Speech & Language Therapist commented: “I tried this app with a range of students with developmental communication disabilities and found several features of it to be useful in practice”. See the review in Communication Matters - the magazine of the New Zealand Speech & Language Therapists’ Association (NZSTA). 

http://www.speechtherapy.org.nz/wp-content/uploads/2013/09/CMMagazineIssue19_v2.pdf