Purpose: Uncertainty over ethical impact may hinder uptake of assistive technology (AT) in dementia. This study aims to examine whether AT contributes to person-centred care, whether users can participate in research and to explore ethical dilemmas with users, family and professional carers. Design/methodology/approach: People with dementia, at home or in residential care, and carers were allocated equipment and consulted about ethics. In a small, qualitative study, data were collected using semi-structured interviews and vignettes and content-analysed to establish themes. Findings: AT in person-centred dementia care requires meticulous assessment, reliability and availability in rapidly evolving situations. Users displayed insight, logic and empathy in ethical evaluation. They disliked remote monitoring and surveillance, whereas carers were pragmatic, prioritising safety. Research limitations/implications: This research provides further evidence that users with dementia can be included in research. It demonstrates a significant potential role for AT in dementia care, with an ethical checklist to help professionals evaluate ethical dilemmas. Originality/value: AT potentially increases wellbeing, enabling users to remain longer at home, delaying or avoiding moves to or between homes.