Only choice for iOS 6 and Feed Wrangler
This is a good RSS reader and afaik is the only choice for devices on iOS 6 using the Feed Wrangler RSS service.
There are some bugs with it however. One is a caching bug, which will pretty consistently "cache" articles that have already been retrieved to your device but not yet read, I hope it can be fixed.
Implementation issues exist as well, it will display animated images such as GIFs but will only save 1 frame to the photo roll rather than the full image, some might consider this a bug as well. Feed Wrangler smart folder support appears tacked on as there is no option in the settings to hide feeds that appear in a smart folder so you get both the feeds and the folder on the same pane. Scrolling up and down with your thumb while reading an article only works if your finger is more to the center of the text region rather than closer to the edge like some other apps.
Technarch about
Reeder 3, v2.2.3