What do you guys think of the iPhone after having been using it for X months/years?

I have owned my iPhone for a year now, and honestly, when I first got the iPhone, it was all cool and fancy, but I am kinda outgrowing it now. I still have another year with my contract.

I mean, don't get me wrong, the iPhone is great, but I kinda feel like 'moving on'.

Thinking of maybe a Blackberry. Waiting on the 9700 'Onyx' model.

So has the iPhone amazed you that you plan on using it for the next 3-5 years, or like me, after a year, you are thinking of replacing it?

(I realise that the iPhone has only been recently launched, and it has been less than a year, but some iPhone owners may have 'unofficially' gotten it earlier, but all responses are welcome)