Hold a sec, so it doesn't mean i'll loose everything related to CD but only services which are not in the other Store/Market? Well as i've mentioned above BMW Store offers basically nothing in my country so i won't loose anything, only gain.
(only the way back could be painfull)
More than BMW Music i would like to add Driver Recorder which wasn't available during configuration of my car (and supposedly needs to be bought within the car, otherwise one is not able to get it) and Remote 3D View which should be included in "Parking Assistant Plus".