Not complete yet and not ready for prime time use are quite different. It’s ready for people to use, and a lot of infrastructure is using it (ParameterizedFunctions.jl is one use, and Pumas is a commercial software that utilizes it under the hood).That said, there’s still a lot of things to add, like automating the algebraic simplifications, automatic GPU support, etc. so where we are vs where I want it to be is still quite a gap. That said, the current interface is stable, and there are ways to do things like unit support, it’s just not the easiest to tell MTK what your units are (exposing type definitions at the higher level is one thing we plan to add fairly soon).