Comment by eslaught

I develop Regent, a programming language for distributed computing based on Terra [1]. We're one of the larger (largest?) Terra codebases and indirect source of users.

(I also help maintain Terra, but this answer is more focused on my capacity as a user.)

Terra is a workhorse and it gets the job done. Overall, compared to a previous iteration of Regent (that was built entirely from the ground up in Python), it's been a good experience. Having first-class code generation capabilities has been really nice, especially with built-in support for things like parsing C header files, vectorization, and CUDA code generation. The language is stable and generally doesn't have many surprises. Unlike, say, C++ or Rust, there aren't as any corners to hide odd behaviors. (Obviously, there still is some room for such things, as you can see in the sibling comments. But I still think it's better than most languages.)

The main issue is, as siblings have noted, the size of the community. While most stuff works, if you find something broken you're likely going to have to fix it yourself. This is an area where we're always looking to grow.

[1]: http://regent-lang.org/