No one has used one yet, please stop referencing 'similar' apps which compare to siri (which is 4S specific, you wont get this with IOS5 on your 4)
There are tablets on the market for £100 with similar specs to others, you wouldnt buy one though as it doesnt do everything as well, this could be the case with siri and the 4S. If Siri works like it seemed to at the conference then it will be worth it over the GS2. I have a 3GS so its an epic upgrade for me.
Not sure why apple fans are going 'oh noez' and android fans are going 'lol' What magic feature were you expecting? If it had a bigger screen you would be saying 'same as GS2' etc What more can manufacturers do now? Put a better chip, improve the camera and better battery is about it for the future (3D is a gimmick)
A5 chip, 8mp camera with HD video, Siri and IOS5 will make the phone (as a package) more than just a rival for the GS2. I dont need a bigger screen, the GS2 is bordering on a tablet. I would have loved a new case as im not a fan of the 4 but then i have not owned one, just played with them. Maybe it will grow on me. Im going to wait a few weeks and see what i want to do.