I agree that Shiira is quite impressive. The only real problem I have with it is that hitting the tab key takes you to the URL window, not to the next data entry field. That drives me insane and keeps me from turning it into my main browser! Though it starts slow, Omni remains my default browser because it handles almost everything with few complaints; the pop-up page-specific settings are handy; support is great; its built-in RSS ability is an added plus and saves me from needing yet another application (I'm still on 10.3.9). I also keep updating iCab for its own unique charms, including superb filtering, direct developer feedback, and general eccentricity.