Ranked in these QuestionsQuestion Ranking
Pro Plugins that extend functionality are available
Pro Highly customizable
Custom keybindings, color schemes, etc. Even the plugins are customizable.
Pro Unfurls long URLs
Shows non-shortened URLs on hover so you can check if you feel safe visiting the URL before clicking it.
Con Out of date
More than two years since the last code commit, this app will fail when Twitter changes their API.
Con No multi-column layout option
You can just see one feed at a time. No way to set up side-by-side feeds.
Con Feels out of place on non-KDE systems
As a KDE application, it doesn't look right on desktop environments other than KDE, such as Gnome, that's used by Ubuntu's Unity.