Objective: To explore patients’ experiences of a self-administered electrotherapy treatment for muscle spasticity in cerebral palsy and stroke; the Exopulse Mollii Suit®. Design: Qualitative design with an inductive approach Subjects: Fifteen patients with spasticity due to stroke or cerebral palsy, participating in a previous randomized controlled trial evaluating the treatment concept.Methods: Information letters were sent to all potential participants (n = 27) in the previous study. Semi-structured interviews (21–57 min) were carried out with all subjects who volunteered (n = 15), administered by an experienced interviewer who was not involved in the previous study. Transcribed interviews were subject to content analysis. Results: The 5 categories that emerged from the content analysis were “New method gives hope”, experiences related to “Using the assistive technology”, “Outcome from training with the assistive technology”, “The assistive technology” and “Taking part in the study”. Respondents felt hopeful when included in the previous study, motivated when experiencing a treatment effect, and disappointed when not. Conclusion: The qualitative approach used in this study elicited complementary information that was not evident from the previous randomized controlled trial. This included statements regarding increased mobility, reduced spasticity, reduced use of medication, and problems related to using the treatment concept.