I am very suprised by your response, its not normal response for someone with police driver in his signature ( and you may wish to review that with your rubber heel squad wandering around the internet looking for good honest helpful people to pick on
).
I've had a snooper radar detector ( soon to be illegal), useless little device, full of false alarms, only really good for telling you if a gatso is switched on.
Road angel, this was quite good, I liked the blackspot info ( never seen a camera near a location yet), but they are expensive.
Sat nav system with camera overlay, this seems the best of all worlds, costs less than a road angel, does what a road angel does ( nearly), and helps me with directions.