In short, I have gone pretty deep with it as a proper "app" builder compared to maybe a more CMS/design use case. By far, for front-end low code UI tools it is my favorite. However, it isn't without the typical pains of that when the abstraction breaks it can be quite a hassle and requires some real knowledge (or support help) to figure things out. The real thing that keeps me on it though is that it really can have hand written react and Plasmic generated react live by side, which drastically lowers the risk compared to a lot of other app builders.
I do genuinely think it can speed up development for certain teams on app use cases, but I think the structure of those teams is a bit particular, because you do need someone who really knows react/next ecosystem to manage the underlying integration.
Thanks to the Plasmic team!
Happy to answer questions in thread