I have the Passport SRX in my S4. It works very well but they don't make it anymore. I never really understood the importance of knowing where the radar is coming from. If you're on the highway and it goes off, just slow down. Doesn't matter which direction it's coming from!
FWIW, I've used both the Passport 9500 and the V1 for extended periods of time and saw no real difference in responsiveness. They both did the same thing.
The views and opinions expressed in this post are those of the author and do not necessarily reflect the official policy or position of Bimmerpost.
2010 S4 Current | 2010 BMW 135i Retired | 2006 Lotus Exige Retired