It's an effective way to see RSS feeds, I have folders for categories of feeds (with the unread amount listed for each folder), each folder has 4-5 feeds in it, and I just start the app, hit a folder and instantly have all the new feeds from that folder mixed together chronologically, then hit a single button and they are all marked read and at the same time I am returned to my directory of other feed folders.
It's a nice simple relaxing way to view feeds I guess, things don't have to do a whole lot to be worth $3 for me, so I just bought it and didn't think twice
TBH, it looks an awful lot like the google reader from their website, probably just animated slicker, I'm not sure. I have to do more clicking through google than I would through my feeder apps to get my info kept in categories. And I get nice little icons of the site next to the item when the feeds are mixed, so I know which site the news is from before I read/expand it.