I was disappointed with the 4GS when it came out but took time to realise how revolutionary Siri was (Which was, essentially yet arguably, the only upgrade - a software one too) (Yes I understand you had the camera upgrade and the processing power but, Apple, I write to you telling you that you have set a precedent - we want more!
Siri was initially an app on the iPhone and no one was interested in it - well, Apple were. Steve Wozniak (arguably and often referred to as the co-founder of Apple) was an avid fan beforehand for example. Woz, as he's usually known in his circles (and after reading Steve Jobs' book I feel like I know him so feel I'm going to call him this too), referenced the before and after of the question: "What are the five largest lakes in America". Before Apple bought Siri Woz got those answers instantly. Now, the answer returns lakefront property sellers (apparently). He has gone on record to say that Apple buying Siri has, apparently, made Siri worse (wow would I have like to seen Siri in it's heyday!) And yes, it might have some bugs, but both him (and I) agree that it is a revolutionary - and will be even more so - product.
He believes it's a mark to where the future is. He's right in my view, it can only get better - so much so, he argues, that it will understand human utterances and faults within speech (i.e. if the user explains "5...I mean 6). That's really impressive.
Google now is the new answer to Siri. It has taken an element of Siri and, apparently, improved it. Instead of being a personal assistant it is just a speech-to-search function. The Siri downfall is the delay is in the ping to apple servers and then to Google servers. The Google Now advantage is that is just needs to ping the latter.
It will be interesting to see what Minority Report gadget the Apple/Google thermonuclear war brings out next.