I just installed this plugin and purchased the feed to post as well as categories. I found out after install that I don't need categories with feed to post. This was my oversight and I don't blame the author for this.
The Plugin was very easy to install and get working. It does what it says it will.
The only issue I have is that under "Feed to Post - Taxonomies" I just get a "please wait..." So this part of the feed to post plugin doesn't work for me. It may be something i missed as I am brand new to WordPress.
I sent an email to the author for support and have not heard back. It is the weekend, so this is understandable. I have no doubt the author will provide support and this part will work as advertised. Once it does, this will have met all my needs.
In general I highly recommend this plugin.