Here's an idea I thought up the other day, which could come in handy when fighting an undeserved (or deserved? ) ticket.
Since RDs w/GPS like the 9500 series know your position and speed at any given time, when they pick up a radar hit, it could record the location where you were hit and your speed at the time. Then, if you get a ticket, and the LEO says he got you at X speed, you can press a button on the RD and see what speed it recorded you at, at the exact time of the radar/laser signal. If it records the location where the signal was picked up, it could be handy for "reconstruction", in case you don't remember your exact location when hit (esp. with I/O), so you can go back and take pictures of the spot, etc.
In an extreme case, say where the LEO clocks the car next to you going 10+ mph faster than you, and pulls you over instead of them, you could even show the RD's reading to the LEO, or use it as evidence in court (don't know how well that would fly), but you could say that you know you weren't going as fast as the LEO clocked you at, and the RD's recorded GPS info would be proof.