I've been quite intrigued by Siri. I recall the voice controls of the last iPod shuffle didn't impress anyone so I didn't buy one, but the Siri thing seems like a introduction in the real world of the fictive HAL.
Like everyone I've seen the videos or the funny screenshots but no discussion thread here on HN. Is it that good? Or should I wait for it to be mature and debugged to try it.
Also keep in mind that Siri is terrible in any kind of noisy environment, especially with other people talking.
I will say that Siri excels at playing specific songs, artists, albums, etc. It's much faster than using the touch UI. Siri is also good for when you don't have your hands free.
Overall, Siri is pretty amazing but it hasn't fundamentally changed the way I use my iPhone 4s. I will say the iPhone 4s is ridiculously fast and smooth, although I upgraded from an iPhone 3G so YMMV.
From what I've seen/heard of Siri I'm totally underwhelmed, and planning on upgrading to a Galaxy SII from my iPhone 3Gs.
I should point out that I'm in the UK, so most of Siri's location based stuff wouldn't work for me, which is a bit of a deal breaker in my eyes.