I do!
But then CD/radio's were standard in cars when I purchased mine and I don't see much point in messing around, given the car will be replaced in a year or so. Also Car CD players, like home VHS video players have a very simple level of functionality, enabling them to be operated by toddlers...
Whilst my children are no longer toddlers, they are now able to operate the car radio without my assistance, whilst they are still coming to terms with mobile phones, iPods etc.