Delay-coupled semiconductor lasers have been proven valuable for the study of delay-dynamics, chaos synchronization and novel applications based thereon. Different coupling topologies and parameter conditions are easy to attain experimentally. We investigate the synchronization characteristics of systems of two coupled semiconductor lasers in different configurations. Based on a modeling framework to describe such systems, we present the stability properties of the identically synchronized solution, which then are characterized experimentally. We are able to connect the overall synchronization quality with the occurrence of intermittent desynchronization events attributed to the so-called bubbling phenomenon, a phenomenon going beyond the linear stability analysis. We show the dependence of the bubbling on coupling topology, especially symmetries and mismatches in the system, as well as on important control parameters. Our investigations are crucial for practical implementations of laser networks and their utilization, e.g. for key exchange applications.