Reviewers see Mercury as a mixed startup banking option: many praise the clean interface, easy onboarding, useful features like virtual cards, integrations, and smooth day-to-day navigation, with a few saying wires and larger payments worked well after review. But the sharpest theme is operational risk: several users report sudden compliance reviews or account closures with little warning, vague explanations, and slow, email-only support. Card limits and support delays also frustrate some teams, so confidence tends to hinge less on usability than on whether support and compliance hold up when problems hit.