For a Benz so large, I find pricing to be fine. It's not THAT much more than an ML, yet offers much more space. I'm sure the GL will sticker for more than this, and being as long as an S-Class, it offers lots for less.
Sitting in the 2nd row, I was NOT impressed with the space. With the sunroof, my head was firmly into the roof, and the 3rd row didn't look as accomodating as I thought it would - or as roomy as many journalists have claimed it to be. Nothing yet beats a minivan.
I personally find the look somehow oddly appealing, but not great. Mainly, the headlights look questionably shaped to me. Way better executed than the Pacifica tho.
And to combat what everyone else has said, I've seen quite a few on the road now. I think for the price of vehicle, they are selling more than I expected them to. At least around the Toronto area.