To be fair Neil, every new pair of Proacs I've heard have sounded like that. They take an age to run in from new (six Months is a good guide!) and I have a nasty feeling that the dem units out there will need time to mature.
Still it is possible that the new ones are just not to everyones taste, this AV lark is killing quality speakers, but I will reserve judgement until I have heard a well run in pair.