There is a thread about BMWs in a radar detector forum that says 'comfortable climate' windshields block IR which in turn interfers with detectors like V1 and Redline.

I am currently running both the V1 and RL and do not have a problem when they are in the proper position but when I want to move them around and put one on the dash then that unit does not respond as quickly.

Can someone tell me about the windshield on a 2008 4.8i sport? I have 'comfort access' but that's about all I know.