Racket is great, and is now able to run on Chez Scheme as the backend. But as far as using it for production code, it's a bit problematic as the folks in charge

Racket is great, and is now able to run on Chez Scheme as the backend. But as far as using it for production code, it's a bit problematic as the folks in charge are focused on it as a research and education tool first and foremost, meaning they are not shy about changing things a lot. Chicken compiles down to C and has a really friendly community with great docs and examples for "real world cases"