Robin Dunlop, a self-employed software consultant with extensive experience, has been using Rollbar for over 103 months, primarily in a maintenance capacity. He is passionate about system maintenance, believing that identifying and fixing issues in existing systems is more beneficial than undertaking large-scale rewrites. Rollbar, a tool he frequently uses, is praised for its ease of integration and effective email notification system with issue grouping, though he notes some occasional grouping inaccuracies that he has yet to address.