I paid for the feed-to-post plugin so I could get away from wp rss multi-importer, which is free, but the author never ever responded to any inquiries at all ever.
So I changed to WP RSS Aggregator, and had issues from the start. I have over 200 RSS sources, but their importer did not import any of their taxonomies or characteristics like author and frequency. That was one manual fix for about 3 hours.
The plugin has a "Debugging" screen, which comes in handy, except that one of the errors is "WPRSS: The feed URL is not valid! Please recheck:" but it does not tell you which RSS URL is invalid. People change their RSS feeds all the time, so it's expected that one or two per week might get this error. I reported the issue to the developers. They told me to go find the invalid URL from the list of feeds.
The next most frequent issue is old posts being re-imported, even though my settings were for no post older than 3 days and "unique titles only." Those settings did not solve the issue. I reported the issue to the developers. They told me first to trash the post. Then they told me to trash and then permanently delete the post. When neither of those worked, they told me to trash, delete permanently, and blacklist every single post that I didn't want to see again. Not really a workable solution.
The URL shortener settings in the plugin simply do not work at all. Never did. The developers did not acknowledge this issue when I reported it.
Finally, the biggest issue of all is that, from my 200+ feed sources, most days the software imports feed-to-post exactly ZERO posts unless I manually go through 3 steps: check all feeds in the debugging screen; manually run the "fetch_all" cron job; clear the WP cache; and then wait. Then all of a sudden after about 20-30 minutes, I get dozens of new feed-to-posts; however, many of them are old, as reported above.
Their support is very responsive, always returning email within 24 hours or so, but they simply never would acknowledge that their might be a bug in their software. Basically, they answer you and politely say, "you're wrong."
The last time I reported these same bugs (the last of multiple times, in hopes that they would acknowledge and update the plugin), I was basically told "we can't fix your problems, so go away."