After 27 days of development, uRSSus is finally a really usable app. I miss nothing from Akregator, although there are a few unimplemented things. It was broken the alst couple of days, because I was rewriting large chunks of its guts, but the new guts work much better ;-)
The missing pieces (I know about):
Save column width in post list
Show total posts in feed list
Drag&Drop is not reliable (weird things happen every few tries)
Metafeeds (ex. your unread posts/ your starred posts) are not updated automatically
Del.icio.us sync is not working at all
No decent config dialog (but a functional replacement!)
Very occasional DB locking.
Logging is broken
Need to implement backup of the DB
That's not really more than a day or two of work.
Right now (revision 570) it's working pretty good, so it's a good revision to try, if you feel up to it.