I've been using rss and atom_syndication to parse RSS/Atom feeds for years. I've had no major issues. The descriptions for both crates say that they serialize to RSS/Atom but they parse it as well.
I picked up feed-rs a few months ago from the original maintainer, and have been slowly cleaning it up (2018 edition, updated dependencies, broader tests). Was hoping to finish off the updates over the Christmas period and push up a new version.
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btw, as a contrast to rss and atom_syndication I was keen to maintain feed-rs because it gives you a single API to parse all formats (Atom, RSS1, RSS2 etc).
Its my first "real" Rust project - I wanted something a little more than the exercism examples to learn some Rust, so its probably full of mistakes and poor code but clippy seems happy. Key changes:
2018 edition
Align feed model around Atom spec
Switch to event-based parser (xml-rs) to reduce peak memory usage and use of clone()
Expanded test coverage
Documentation improvements
I do plan on using this in a different project (a replacement for fever, a web+app based RSS/Atom reader that is no longer maintained), so I'm expecting to issue a few more releases to feed-rs to address bugs, handle more of the RSS spec etc.