The author, David Smith, is not an unknown force in the iOS development community and usually releases products that feel like he cared for them and sustains them with regular updates.

He talked about FeedWrangler on his Podcast, Developing Perspective, and while I can't verify his claims that he already had started the project he really seems to be a very nice guy and a competent developer.

The reviews seem to back this up. Also, he will offer a refund in case you are not happy with the result.