Managed to over complicate what is in effect a simple process. The display is confusing at first, and takes some getting used to.
Multiple accounts, Tweetie handles multiple accounts much better. As for functionality Twiittelator Pro is still by far the most feature rich Twitter app for the iPhone.
On the plus side TweetDeck is free. But as I say, cluttered user interface really put me off. Remember this is a personal view, some people will love TweetDeck for iPhone, I am not one of those people.