I wasn't happy with my the day I test drove it. I had aftermarket Morimoto HID system mod on my c300 and I knew their used the same bulb (H7) as c300, I was able removed and to moved the whole HID system over to GLE with an additional cost of $3 for the bracket to hold the Morimoto H7 base to lock it in with GLE base. I loved it since then. Hope this answer or help out.
On a side note: of course dealership will said "not an easy solution" they will always want to up charge a $30 part to $1500.00. Mine was with retro-fit a backup camera for my GLE, I didn't want all the junk like: Map, HDD, voice-control ect... My previous car was loaded with all that and I barely used it. It's mostly local drive to all the destinations I already knew.
Anywho, I'm stilling wait for some information on how to remove the "lift-gate" panel and still able to reinstall it with damaging it. I knew how to access and head unit already, I just need to run the cable and power the camera plus access to the engineering menu aka "secret-menu" to auto-switch the screen once the Reverse gear engage.