Run a search on the Forum. I originally wanted to get the Panoramic Roof with the carrier offered by Ford. When they told me that you can't use the rack with the glass, I got some good suggestions for other roof racks that I liked.
Sorry I searched before I posted and again just now, only found a thread where you mentioned the same thing, but could not locate the post you are referring to.
I've heard similar things about the pano roof and load capacity in general, but thought it was just a big decrease in the load rating, not a complete no-go - but it makes sense they would just say no to it since some vehicles will have a higher load capacity than others to start with. I have seen other ford cars (not C-max) with the pano roof and a rack, but again that is apples and oranges. As far as maximum functionality though, the pano roof (in general) would be a problem if you gotta haul stuff on the roof.
Back to the original question, I am leaning more towards the dual carrier, and may do something with the blocks and a bar pad to hold one kayak flat when I only need to carry one of them.
On a side note, I was looking a permanent roof rack installs last night and happened upon this:
There is a gutter strip cover on the flex which looks like the one on the c-max, and if they are similarly held in place, it seems likley that a low profile permanent attachment with the Yakima landing pads could be an option for folks who need more security than a clip on rack can provide. It would require drilling the strips, but that is much better than drilling the roof for a perma-rack. I am not really keen on selling my Thule rack and buying new Yakima stuff, but it could be a project I look at in the future.
Edited by CNCGeek, 07 June 2013 - 06:17 PM.