My startup used Fly for almost a year. The core feature of code to deployed code in less than a minute is beautiful. Spinning up / down new nodes for backfills takes seconds.

But the company feels a little immature. Once our API server became unreachable in Fly for 48 hours. I'm not sure if it was my fault for getting config wrong or if they just had another "silent" failure. They have a "db" product, but it's "not managed postgres". Would get consistent disconnections from that. Just feels weird for them to add a top level noun in their cli for postgres and then limit the extent it's a feature they support.

API access to their core service would frequently go down and leave us waiting to deploy new service fixes.

I miss the deployment experience, but I'm frankly happier with Cloud Run on GCP. Just way fewer "surprises" and much more complete documentation.