qBittorrent is great. RSS works very well. Using qBittorrent 3.3.7 on Fedora.
An improvement would be : In the RSS view, It would be great if there was either :
a simple search bar on top of the feed results to filter out results from a feed, in case a filter didn't work and you want to "manually" download a result from an RSS feed, without scrolling through the results or using the main search.
or, when in the dialog for a specific filter rule, being able to double click on a result in the corresponding RSS items pane, to manually initiate the download of that item, if for example it wasn't downloaded for some reason (e.g. time match restriction)