Garage Cabinets, Garage Storage, and Garage Organization

I have acquired a 320D Touring (E46) with Business RDS radio and am thinking of adding a CD changer. I already have a Kenwood changer unit from an earlier car and, with a Connects2 adaptor could fit that, but I am also looking at BMW units, on e.bay. When I visited my local Car Audio shop I was told to be very carefull buying a BMW unit as the Becker/ Alpine ones sometimes has a fault in that the CD can fall out of the magazine and jam up the changer. There is a fix, if I am prepared to pay. Anyone out there able to confirm there is a problem, and if so is the fix something I could do at home?

Chris