Keystone Credit Union is praised for its helpful and friendly staff, who are committed to assisting members with their financial needs. One customer highlighted the exceptional service provided by Minnie, who worked after hours to finalize an auto loan, ensuring they could get their vehicle the same day. Despite initial difficulties, another member experienced a positive turnaround after speaking with different staff, particularly appreciating Minnie's knowledge and support. Overall, Keystone Credit Union is recognized for its dedication to customer service and willingness to help.