Although not mature enough, this browser is already my default one. It is very promising. Here's my list of pros and cons, some might be redundant since Uniball mentioned them.

Main Pros

• Light weight
• Uses gecko, the best rendering engine till now IMHO
• Depends on GTK2 only, no Gnome dependencies
• Plans to use different engines (Dillo, w3m and GtkHtml)

Secondary Pros

• Very cool RSS feed support
• Customizable and very advanced features: for example, few things i liked
  • Variable tab length
  • Chose whether to have a close button in each tab or not
  • Closing all tabs to the right or left of certain tab
  • Recently closed tabs
  • Extracting links from webpage
  • Going up (to parent directory)
  • Highlight some text, right click, chose "Launch Editor" and here you go. You're favorite text editor is opened with the highlighted text within it.
  • Many more features

Main Cons

• Very weird interface as Uniball mentioned
• Uncustomizable toolbar
• Missing some toolbar icons (home, new tab)
• Uses a mix of hardcode icons and stock Gtk2 icons
• No image resizing