Sorry I didn't see your post.
Adjustability so you can get the rails straight is nice.
Anyway, I ran across a creotec video, that shows how you shave a bit of a tile to clear the hook. I was wondering about that. This would apply to other hooks as well I think.http://www.youtube.com/embed/4O0mX1G0sZ0
The racking system in that video looks OK but I think we still prefer horizontal rails and clamps, for various reasons, especially the ability to use grounding clips, and supporting the modules at the points recommended by most manufacturers.