Mr. Adams shows us how good it will look without it. Have you ever needed a roof-rack in the past? Will you be doing any long-distance traveling that may require you to add a cargo carrier up top? Also, I would think that traveling on the high-speed portions of the autobahn you would notice a decrease in wind noise.
GLK's very nice. UNLESS I was going to do a lot of heavy traveling or lugging...I'd lose the rails. You'd think MB would make the rails removable. That ride's too stylish for those massive rails. But, that's in my opinion. Congrats on those wheels.
They look like shit but they are awfully nice to strap luggage too on a long trip so you don't have to deal with it up front. But if you never plan on doing that then ditch them.