I badly want to try out Mercury, in fact I have an account already, but they don't yet support Zelle. I really hope their national bank charter application gets approved. (They applied for one last December.) Once they support Zelle, I'll drop U.S. Bank, as their app sucks and they don't have an API.
Ironically I dropped US Bank for Mercury too. You’ll be glad you did.
You could try them out while still having your US Bank account.