Ollie, I'm having trouble aligning the iPhone and iFly images, but it looks like the echos painted on the screen are fairly different.
In pic #1, for instance, iFly shows you in the middle of some strong echoes, but iPhone shows you in green echoes.
Pics 3 and 5 seem to be the other way around--iPhone shows you in green echoes, but iFly shows you "in the clear". (Oh, wait...maybe I'm misinterpreting your aircraft position on the iPhone. Is your plane the smaller x, not the one at the center of the compass rose?)
Could you talk a little about whether the two devices were giving you the same info? Does the iPhone just show "green" for some echoes that the iFly shows yellow or red?
Thanks for the pics!