I use Newzie, and used FeedReader before that.
I switched from FeedReader because it didnt offer enough functionality, but recently Newzie started crashing randomly and stayed in the memory even after closing the program, thus eating ~30MB of RAM. So I'm looking for a better reader now.
The Poly feed seems to be working fine.
BTW, I reccomend you to use the entire text of the entries, it's annoying as hell to be forced to go to the original site to read the full text of an interesting post.