Great job! I'm the creator of RSSHub (https://github.com/DIYgod/RSSHub) and Folo (https://github.com/RSSNext/Folo), I previously used rss-parser and encountered some issues, feedsmith has features that interest me, I'll give it a try!
It also turned out, its performance is not that good. In benchmarks, it's 4-5x slower. In my case, switching to Feedsmith almost doubled the overall parsing speed. This is including the fetching of feeds, which is the main bottleneck.
PS. Great projects, I know and follow both. :)