Costco Pharmacy is a mixed bag, according to customer reviews. While some customers praise the pharmacy's great service and helpful staff, others find it disorganized, confusing, and overcrowded, especially during peak hours and on weekends. The pharmacy is commended for its product variety, cost-effective prescriptions, and willingness to assist with last-minute transfers. However, some customers have experienced issues with double-charging and long waits. Overall, Costco Pharmacy seems to offer a good selection and service, but the experience can vary depending on the day and time of visit. Customers are advised to be patient, respectful, and aware of the potential for crowding and parking challenges.