I have really taken a shine to this app. I know that there are updates in the works and congratulations on making a fine app. The one problem that I have noticed is that if I have to scroll to different RSS feeds on the upper left hand side of the app, the scrolling seems half hazard/difficult/jumpy. I'm not sure what to suggest as a possible fix for this. But all in all, this is a great app and one that I'm happy to purchase.
It certainly is a good-looking, full-featured app. The "read offline" option may be useful because my feeds tend to pile up sometimes. Like a few other comments, performance seems to bog down somewhat when you get a high number of items, and as much as I like the look of the UI, it takes some getting used to. I guess I'm used to standard black text on white background. Was this an attempt to replicate the kindle style e-print that is easier on the eyes for some, or just an aesthetic choice?