James Squireswrote a review of Yakima Tube Top Frame Adapter on April 6, 2014
Familiarity: I've used it several times
I mean seriously heavy. It does the job but I doubt that it had to weigh that much. It would be better if there was some way to fix the length so it wouldn't move after it is attached. Not that that affected the end result but it was a bit annoying.