I have Riderscan laying on my shelf. Used it for a month or so, just to find out it was completely useless. Very close objects, like my arm, my helmet, etc are very well displayed in Riderscan. But when you're talking about the vehicle behind the perpherial vision of your eyes, it becomes too small and destorted to get your attention. So, you have to do shoulder check anyway because you can't trust your Riderscan.
That said, I removed it as it was just hanging on my screen for nothing.