Purpose -Positive behaviour support has been positioned by current government policy as an important intervention for people with intellectual disabilities who display behaviours that challenge services. However, little is known about service user or carer opinions towards the use of this kind of model. The paper aims to discuss this issue. Design/methodology/approach -Opinions and experiences of 25 carers and six service users were collected through semi-structured interview as part of the evaluation of an enhanced service, Complex Behaviour Service, based on positive behaviour support principles. Findings -Content analysis indicated that the service was seen as acceptable and useful and that positive experiences of the service linked to: frequency and availability of the service; talking about behaviour and being listened to; understanding, and change in, the service user, carer and behaviour. Originality/value -This adds to the small but growing literature on service user and carer opinions towards specific interventions and highlights themes that future services could consider in delivering evidence-based care.