The first successful launch of a Western spacecraft incorporating Stationary Plasma Thrusters (SPT-100) occurred in 2004. The SPT subsystem has now had over two years of successful daily operations in orbit, and is successfully being used on two other geostationary communications spacecraft built by Space Systems/Loral (SS/L). These SS/L built subsystems are based on the successful Russian SPT technology operated in space since the early 1970s. This flight heritage, combined with the high reliability and relative simplicity of the thruster, motivated SS/L to qualify the SPT100 thruster specifically for Western geostationary communications spacecraft. Onorbit results are presented and compared to predictions for thruster performance, and spacecraft interactions such as EMI/EMC, plume effects on solar arrays, and thermal control surfaces. Daily operations are described, including the use of on-board maneuver software which permits weekly maneuver table uploads and subsequent spacecraft autonomous operations. The extensive ground qualification and life testing completed prior to first flight are also summarized.