For me, it's hard to quantify. Writing Rust feels different from any programming I've ever done in the past 12 years. It reminds me of the first time I dove into functional programming. You pay so much of the development cost up front in both time and frustration. But once it works, the guarantees you're left with provide a level of security and confidence that's unmatched in my experience. Somewhat similar to having a high quality unit test suite and strictly following TDD Kent Beck's way. The process is weird, but I love it.