Reviewers see Mercury as useful and easy to adopt, with repeated praise for its clean interface, straightforward setup, virtual cards, integrations, and startup-focused workflows. A few founders, including the makers of
CatDoes, also highlight its API and operational fit, while others say it works well for treasury or paying contractors. But the sharpest criticism is about reliability: several users report sudden account restrictions or closures, compliance issues, slow email-only support, low card limits, and operational disruption.