Lessons learned from 10 years of STELLA

STELLA is a robotic observatory on Tenerife, which is currently housing two 1.2m robotic telescopes. One telescope is fibre-feeding a high-resolution (R=55,000) echelle spectrograph (SES), while the other telescope is equipped with a visible wide-field (FOV=22’x22’) imaging instrument (WiFSIP). Robotic observations started mid 2006, and the primary scientific driver is monitoring of stellar-activity related phenomena.
Over time we changed individual components to improve reliability, service-friendlyness and data quality. We give an overview of what was done and what was achieved, and what lessons can maybe learned from this long-term excercise.