With no user reviews here, the picture comes only from founders, and it is narrowly positive. Makers of Seagull say Fly.io made launching their Golang API trivial, while the maker of Termaxa describes a very simple path from Dockerfile to deployment, domain, and quick releases. Beyond that, the review set offers almost no concrete criticism or detail, so the clearest takeaway is that technical founders value Fly.io for straightforward deployment and fast iteration.