Using the 3G iPhone AS a GPS?

Been looking at the iPhone page for Maps with GPS feature.

Will this replace my “proper” existing GPS (a Road Angel 6000)?

It seems obvious that it should – but I don’t see the same perspective view that I am used to with a GPS in a car.

I guess the much bigger screen and the zooming functions with the Google Maps would make up for it – might even be better.

Anyone used an iPhone as a GPS before? Put your experiences in Comments.