Using a radar detector as an added tool of awareness, definitely improves your odds of not receiving a performance award. It definitely does not guarantee against it.
Being stopped with a radar detector visible to the officer, definitely improves your odds of receiving a "full citation" without any mercy.
Radar detectors can greatly improve your odds of avoiding tickets in situations where you are heavily focused on traffic patterns, road conditions etc., and not paying enough attention to who is looking AT YOU.
IMHO it should be illegal to sell an FJR without a RD. It should come pre-installed with a USB port to periodically update the firmware. Anytime a strong radar signature is detected and followed by a rapid drop in your speed to 0-mph, it should Bluetooth updated contact information for area traffic lawyers to your phone.
The Commonwealth(State) of Virginia should cease receiving any type of Federal funding until they abolish their unconstitutional law against radar detectors. It creates an undue technical hardship for residents of adjacent states. I have routes that do nothing more than avoid VA if you need them.
Personally, I need AUDIO from the RD. VISUAL does nothing for me beyond confirm that the Officer did a really good job of making all the purdy lights come on. Audio from an RD fits nicely into my "heads-up" approach of piloting an FJR.
RDs are obviously part of just another game of technology leap-frog. It wouldn't surprise me one bit to discover that the same engineers who design the radar guns, design the radar detectors. And that they simply move back and forth between projects.
If nothing else, running an RD will purchase you one hell of an education about how the police in your region work. You may find that particular areas purposely target bikes, while clearly and obviously allowing cagers traveling at much faster speeds to zoom on past. You may also find just the opposite to be true in other areas.
The RD will cost you about the same as a set of new tires. My advice, pick up a refurbished 8500 on Ebay and give it a whirl. Undoubtedly you've also spent money on tires you didn't.