Have just replaced my Hero with the iPhone and I just wanted to do a last post with my thoughts as I know that dome people come here to get opinions before taking the plunge with one handset or the other.
For myself it is a complete no-brainer,I have used the Hero for about 3 months and moving over to the iPhone was a revelation,basicaly everything works straight out of the box,no having to download extra apps to text,email etc.The music player sounds amazing compared to the Hero, the UI is a dream,intuitive
and responsive,even the lower spec camera takes vastly superior pictures and video.
I certainly don't find it problematic not being able to run multiple apps.
The app store is well presented and easy to use.
I really regret getting the Hero now,it presented more problems than pleasure and more significantly could not even fulfill a simple function such as delivering a text message to me without installing the 3rd party app SMS to mailbox.
In my opinion the Hero is badly designed and rushed out,do yourself a favour and get the iPhone instead.