It has been successful, but I recently had to patch it to remove a new annoying «made with appsmith» ad on our applications that can only be disabled on the enterprise edition or if you edit the source code of the open source one and are willing to share your patch of course. Another important planned feature, SAML/OpenID has also recently been announced to be only for the not open source enterprise edition. Their Kubernetes helm chart is a mess too. They want to be noob friendly with everything in a single stateful container. I understand the reasons, but I don’t like it.
On the good parts, we build applications in a few days, and it’s great for prototyping and simple applications. One large application we build has reached the limits of no-code platforms, in our opinion. It will be rewritten in code, but we think it was not a waste of time and resources as we could iterate fast, and we didn’t know whether a more expensive development would be worth it.