I'm using it as my main browser, but it has issues:

* can't tell easily whether current page is bookmarked

* address bar only supports url completion (i.e., no search by url/title keyword, but you can use Google Quick Search Box for that); Chrome has the best address bar IMO

* the preview screenshots are cool, but the title of the page should be displayed below each screenshot (many screenshots tend to look the same)

* no way to force new windows to appear as new tabs