Mike from Vesta (first demo video) claims Devin saved "at least a hundred hours" debugging API integrations. That seems crazy to me - API integrations rarely take that long, and any engineer would spot issues like wrong API keys almost immediately. The tool might be more valuable for non-engineers creating initial drafts, but by the time you've written all the detailed specs for Devin, a mid-level engineer could have made significant progress on the task.