It means I can install it easily and it's probably going to work well on the first try, and it'll likely start up and run fast.

It also uses clap for argument parsing so I know I can run it with `--help` to discover its options, and that the parsing of flags is likely not buggy, and consistent with other Rust tools I use.

None of this is _guaranteed_ with Rust, but the tooling and libraries make it so much easier for you to succeed at making a fast and robust piece of software. So for me "written in Rust" is usually a quality indicator of sorts. It's not 100% though, there will always be misses because it's still very possible to write bad software in any language.