First, it is compatible all over Europe. Second, it not only has the speed limit displayed, but also notifies you when you are approaching a speed trap! How cool?
Turns out that Google and the French Competition Authority just entered a settlement regarding advertising on the Web. As Google rejected advertising for NavX (the company that collects the speed trap data) because radar detectors are illegal in France, French authorities requested Google overhaul their policies and procedures for rejecting sponsored ads.
Google agreed to a three month notification period for ads they reject. The adjustments currently only pertain to France, but they will eventually be effective worldwide.
Although the FAC made Google change there policies on a worldwide scale, NavX still filed a commercial suit seeking 7 million euros in damages to their business. Yikes!