Purchased the plugin with an add-on and everything seemed to be working ok... until it didn't. It suddenly stopped fetching items, saying that my RSS feed wasn't valid when it was (I checked and rechecked).
Contacted support and they said the feed was blocked or something silly like that, which wasn't true. My guess, they just didn't want to look any deeper and acknowledge that their plugin is very buggy.
I deleted it and have been using a different one without any issues. DON'T WASTE YOUR MONEY!