Size was a big concern before I got mine. More whether it would fit in my pocket, which it does.
I have had a few comments from colleagues, like "what the f* is that" but they are just messing. Once they see the screen/camera people like it. Some think its a tablet.
I don't take many phone calls so not too bothered about the whole holding it up to my ear thing. After having had the phone for 3 days you get used to the size :smile: Holding my old iPhone 4 feels like I am holding a matchbox now and I don't see how I ever managed to use such a small screen.