I tried it. I must admit, overall it felt very fast and snappy. But there are a few things that keep me from using it.
1.) The Toolbar on the top and bottom takes up way too much space. I know its configurable, and i disabled a lot of stuff, and its still taking up a lot of room.
2.) Seems to take up a lot of memory. After about 30 minutes of using it, opera.exe was using up over 60mb of ram! Must be a memory leak, or its caching a lot to memory.
3.) It doesn't seem to recognize any MIME types, even though they are set properly. Music, video's, etc - it has no idea what to do with them when clicked.
4.) Using mousewheel to scroll up and down scrolls too fast, making it difficult to keep my place while reading.
5.) Completly ignores my windows theme for things like scroll bars and buttons.
6.) I don't like the way the main window is considered a tab which is always open. It contributes to problem #1
Oh well, back to Phoenix for me. It might be slightly buggy, but I love using it.