A friend of mine is a property agent and is using a HTC (can't remember which model). As I was with him yesterday, calls keep coming to his phone and although the conversation time with each call was very short (less than a minute or at most a minute) the phone was very hot (my friend complaint about it and put his phone on my palm to let me feel it).
So I'm quite concern about this now. Guess the Omnia is one of the better ones now. Haven't tried the X1 yet. Hopefully will not be far worst.