Reviewers mostly see Brex as a strong finance tool for startups and growing teams: onboarding is often described as fast, the dashboard simple, and spend management, virtual cards, bill pay, accounting integrations, and credit limits useful for keeping expenses organized. Some also value rewards, yield, and the founder community. But recurring complaints center on product instability and policy friction: reporting can feel limited, bill pay and reimbursements buggy, the mobile app rough, and frequent feature changes disruptive. Most seriously, several users report sudden account closures or harder onboarding, creating clear trust concerns.