Excellent! Excellent warning system with useful average speed notification. I run it in background and have Satnav running on the screen. Good customisation.
I had CamerAlert on my previous 3GS and it was brilliant then upgraded to 4S and had problems but the folks at CamerAlert support were brilliant and sorted it out for me; it just took some details and 30mins and then up and working perfectly. The app is fantastic but what’s even better is the support that you get when there’s a problem. 5 star Service.