I have been using NetNewWire since I bought my phone but it lack of landscape is really annoying among other things. My RSS is by far my most used app, so details matter. Heres the features I looking for ( * means that it is necessary)

*built in browser

*landscape view for the browser

back button for browser ( to go back a page not back to the summary )

*Auto updating / autosyncing (i thought was obvious till i tried GRiS )

*can read feeds separately (ie not how byline is set up)

nice UI

Fast

stable

Adjustable fonts / nice fonts for summaries

*A way to add feed in bulk ( import ompl , import for web readers)

Sync with anything reliably