Right found it. From BHP Plus, the dealers over here I've found, response to a question on Nov 26, 2009.
"Hi John, thank you for your comment. Despite this article, we do not disagree with ECU remaps. We know they have their place in the market. However it is not correct to say that an ECU remap will provide bigger gains than a tuning box. A good ECU remap may provide better gains over a poor tuning box (of which there are many) but the way out boxes work means they will generally give similar results to a remap.
In terms of DPF, that is probably where our tuning boxes have an advantage over a remap. Again, poor tuning boxes can cause problems with DPF?s (as our old boxes did over a year ago). However the Speedhawk system has smart technology to prevent DPF issues and they work seamlessly with them.
There is a lot of bad press about tuning boxes generated by ECU remap companies and customers of poor performing and cheap tuning boxes. But a good tuning box like the Speedhawk box will do as good or better job than a remap."
Does that tally with your findings?