Ask HN: How is "Sign in with Twitter" performing for you?

I was wondering how Twitter signin is performing for non-social sites. I understand that Facebook Connect is the best solution in case you want to leverage the social graph. But if you just want a quick way for people to sign up without having to register, Twitter is the least intrusive, least binding way for the user to try out your service. So, I was wondering, how does Twitter sign in compare to FB Connect or OpenID in terms of conversions for you?