It's hard to justify the extra cost...think about it..

you get to watch DVD movies on an 8inch screen while in park!! (when is that practical?? in the mall parking lot while you wait for your wife to finish her shopping??)

and you get a DVD changer which is getting pretty outdated since now everyone has an IPOD capable of storing thousands of songs for just a few hundred bucks!!

i have one, my wife has one, and my kid has one...

again, unless the sound quality is truly significant over the stock system (and i mean like night and day) then maybe....

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2012 X5 50i M-Sport
2014 X3 35i M-Sport