i've used the older road angel, very good but you have to be able to update it so check out the subscription cost, i think it's annual.
Basically when you see a camera you report its position by pressing a button on your road angel, then when you update yours it updates everyone. Downsides are it also does this for blackspots. Everytime someone brakes on the motorway they seem to report it as a blackspot, so your road angel beeps constantly. You can delete them one by one, but they all come back when you update :/
But speed camera wise yeah good, this one also had the radar gun detector but didn't get to try it.