It's beyond amazing imo. Tricky in some areas but I just launched a pretty complex app in 4 months with 100% attention given to both android + ios, and it was just 1.5 developers (averaged over time).
The ability to reuse code is very real, even sharing a lot with a web react app since most state/business logic is in some flux implementation.
The pain points (documentation, build process, etc.) are real, too, but things I can forgive for now due to its newness and its very strong foundation.