Morning! I'm new to the site and new to BMWs so excuse my ignorance! I am on the hunt for a 6 series convertible and would prefer the 645 or 650. Having viewed a car yesterday, I have concerns over the convertible reliability. I currently have a 350z and the roof has had its share of issues and wondered if BMWs are known to be problematic? My next question relates to the sound system. My 350 had an upgraded Pioneer stereo which sounds very nice. Having driven a 645 yesterday, I was less than impressed by the sound system. I wondered if there was marked differences in the models to be aware of or possibly, is the car easily upgraded stereo wise? Thanks, G
