We've been using the interface with the Texas vaccine registry for a several years. Setting it up was very.. trying. But now that it's working, it's so much better than keying it in. How well it works will probably depend on how well AC/STC works with each state registry. The most problems we've had with this interface is when there's a new vaccine code (hello, all the COVID vac codes) and AC doesn't have it added right away. I have had to contact AC on several occasions to get codes added. (I know we can add CPT codes but to get the vaccine part to work AC has to do something to the med database, I think.)