Television (TV) remains one of the most important media channels in our daily lives. Smart TVs support highly interactive functions between the TV and users, offer Internet connections, and run various applications. Compared with traditional TVs, smart TVs are designed to deliver fuller and richer user experience (UX). Few prior studies, however, have identified a comprehensive set of smart TV UX factors. The objectives of this paper are: (1) to identify salient UX factors of smart TVs, (2) to develop measurement scales for those smart TV UX factors, and (3) to verify their collective effects on user satisfaction and usage intention. Taking a multi-study approach, we identified a comprehensive set of smart TV UX factors, developed psychometrically strong measurement scales of those UX factors, and examined their effects using large-scale survey data collected from existing smart TV users. The study results confirm the significant effects of UX factors in determining user satisfaction and usage intention, providing practical implications for smart TV manufacturers and service providers as well as theoretical implications for HCI researchers.