i like it...
i've been on vodafone for years and thought i'd never moved, i've had N95's, Sony Ericsson W910i's, 8800's (Scirocco & Arte) and a whole bunch of other devices, which depending on where you are, performed adequately well for a mobile device. Didnt think much of the original iphone for not having any 3G capabilities so didnt really explore it, but have jumped on the bandwagon with the 3G and left my almost 10 year contract with Vodafone.
So far, i don't regret it, i think i would have rather stayed on vodafone, purely for historic reasons, but the 3G iphone on O2 i'm using is pretty speedy and certainly destroys the competition in terms of being able to display what i need. So, it may take a couple of seconds to load the bbc front page, but then it is downloading the full desktop experience and then crunching it to fit into safari for iphone, but the postives of having the full desktop experience far out way the speed, size, or anything else that all of the other devices could offer. The real gem with the iphone is the screen size and the device size, i.e. slim so fits in pocket. This far-outways the micro-seconds savings i might make on different 3G areas. (And to be honest we don't get 3G everywhere anyway, so until that happens, there isnt much point in worrying about it).
I'm definitely not a mac fanboy, nor an iphone fanboy (i lean way towards the windows environment) but i must say, i do like this 3G iphone a lot and it's gonna take something really special to tear me away from it... (nokia 5800 tube maybe - although looks pretty thick/deep)....