Reviewers mostly praise Synthesia for making polished videos quickly, with easy editing, realistic avatars and voices, and strong use cases in training, onboarding, demos, sales, and client communication. Several say it saves time and is simple enough for non-video teams to use. But negative reviews are sharp: users report long waits for avatar creation and manual review, failed renders, account bans or policy-based rejections, weak refund handling, and slow support. A few also want better design controls, and some think rivals like HeyGen now offer better output quality.