We compared overall treatment satisfaction and helpfulness of treatment components for 216 clients randomly assigned to day versus residential treatment. Baseline interviews were conducted near admission using the Addiction Severity Index, Beck Depression Inventory, Symptom Check-list-90-R, and a social support measure. Follow-up interviews occurred 6 months later with these instruments plus a client satisfaction measure. Clients in both day and residential treatment were highly satisfied with overall services and most treatment components. Satisfaction scores were high and did not differ between modalities; however, mental health services were less helpful to day treatment clients, and more day treatment clients indicated not receiving certain treatment components. Client satisfaction correlated with treatment retention and several baseline and 6-month severity outcomes. These findings indicate day treatment may be as satisfying to clients as residential treatment, and give credence to the idea that client satisfaction assessment should be routine in outcome evaluations of drug abuse treatment.