Everything works fine across all browsers for me ... Perhaps it bogs things down slightly, but not as much as some sharing programs out there. And I love that it doesn't open up new windows and tabs; it opens up simple pop-up boxes when you share -- and that's difficult to do, especially with Google's API.
The only thing that doesn't work is the e-mail button. This would be a mandatory plugin for all my domains if I could get that e-mail function to work ... like a nice, lightweight popup box appears.
Has anybody found a solution to this?