I'm also using Newzie, it has some unique features that set it apart from the rest of the readers (page monitoring, color-coded feeds according to the time of the last update, news slideshow...), and aside from some bugs and usability issues (like when you click on the title of the article, it gets opened in another tab in the reader, and there's no way to change this), it's pretty much complete.
Looking at the state of RSS readers, it looks like there are not many things going nowadays, apart from improving integration with online readers (RSSBandit recently implemented synchronization with Google Reader, a first in the field), and most programs are abandoned. One could argue that Google Reader killed most of them, but I think the problem is that the RSS thing didn't really catch-up with with users, and being such a competitive field, I guess that once the programs reached a certain state, the coders didn't found many reasons to keep improving them. Or not, who knows :)
Personally, I think FeedDemon is the best hands down, although the lack of page monitoring is a deal killer for me. RSSBandit is also pretty cool, as well as FeedReader and GreatNews. The rest are more or less OK, there's a serious focus in using Java and .NET for some obscure reason, and the bigger problems with the other alternatives are mostly cosmetic and usage related: Alertbear lacks some basic functions, BlogBridge is partially broken, RSSOwl clones Eclipse interface (I don't know if that's a good thing or not), Awasu is ugly as hell, OmeaReader tries to be a lot of things, and fails at everything (while being the only payware reader in the bunch, since the free version is pretty limited)... Some can't even get the most basic feeds as they should, so...