I feel a sense of dread whenever I see this box. Is it going to let me through, or am I going to spend the next few minutes futilely clicking signs and lights, only to give up and leave the site?
Personally, I've reached the point where this is the first thing that I do. If a site is presenting a CAPTCHA (especially one run by Google) to me, then 90% of the time, that's a site I'm better off avoiding anyway.
That last 10% can be infuriating, though, and I certainly won't feel positively about it.