ISOLDE delivers beams of radioactive nuclei via a dozen beamlines to many experimental setups, which perform over 50 different physics experiments per year. Some of them are “travelling” systems, which come to ISOLDE shortly before the beam time and shortly afterwards move to home institutes or to other radioactive beam facilities. Several experiments chose ISOLDE as their home base and stay here all the time. They are either too complex and heavy to be moved around or the beams delivered by ISOLDE suffice for their physics programme.