The place to discuss everything else..
I use this website. you have to pay, but its the best out there that iv tried. It sincs to your MMI via the USB and shows up all speed cameras including mobile ones. You can add other POIs too.
Are you asking me? if so then no voice prompt, but I get a nice little "bing" when near the speed cameras. This is activated by the arrival near destination feature in the MMI which you can turn on for various POIs. To be honest, I would hate a voice prompt. What is that actually? someone saying "your approaching a speed camera"? horrible given the amount of them that there are. The prompt that it give sis nice and discreet