I've been playing with RSSBandit since the last release (SharpReader is the only aggregator I'd ever used).
To me RSSBandit feels too twitchy, to many refreshes for the tree so it flashes a lot during updates.
But the most annoying thing I've run across is the popup bubbles during feed refresh. When I start RSSBandit I have a ton of the bubbles pop up, when I clear them more pop up, it's quite annoying and I can't find any setting that lets me turn it off. It would be somewhat less annoying if it only opened one bubble and just updated the text but I've found that a full feed refresh forces me to click on the bubble dozens of times to get rid of them all.
I'm running Windows 2k sp4.
Steve,
This was a bug in the previous release (v1.2.0.42) that's fixed in the current release (v1.2.0.43). Hope the new version meets your needs.