they've certainly done a nice job with the '13 refresh.
I would have liked for them to make Optical Parking Sensors and several other safety features standard. I've done a few small things to the MB, but I can't do as many mods as I did to my jsw. I would change to the aspherical mirrors, added a/c cooled seats, expand the hatch a bit, and raise the car an inch or two.
the screen is brilliant, though navigating through the command system is a bit confusing. they've almost put in too many options to distract you from driving. of course, I think i'm now just accustomed to the vw interface.
highly recommend one, though the diesel fuel economy is not as good as the TDI. Surely the GLKs are heavier, have more drag, and a smaller gas tank.
Would really love it if Ross-Tech would build functionality into VCDS for MBs.
Test drove it today. Drives like a sports car, comfortable, computerized screen gizmos.